JavaScript/Dashboard

	THIS PAGE IS OBSOLETE
	This article is in parts, or in its entirety, outdated. Hence, the information presented on this page may be incorrect, and should be treated with due caution. Visit SpiderMonkey.dev for more up to date information.

Security bugs

• sec-crit bugs
• sec-high bugs

B2G 1.4 (Dolphin) Blockers (Gecko 30)

No results.

0 Total; 0 Open (0%); 0 Resolved (0%); 0 Verified (0%);

B2G 2.0 Blockers (Gecko 32)

No results.

0 Total; 0 Open (0%); 0 Resolved (0%); 0 Verified (0%);

B2G 2.1 Blockers (Gecko 34)

No results.

0 Total; 0 Open (0%); 0 Resolved (0%); 0 Verified (0%);

Beta Tracking Bugs (Firefox 95)

Firefox

Currently in BETA channel
Moves to RELEASE week of December 7, 2021

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
1639157	Crash while collecting the nursery		crash, stalled	P3	NEW

1 Total; 1 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Aurora Tracking Bugs (Firefox 54)

Firefox

Currently in AURORA channel
Moves to BETA week of December 7, 2021

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
1345145	Regression on code-load by tracelogger hooks and reserved word handling		triage-deferred	P3	REOPENED	Hannes Verschore [:h4writer]

1 Total; 1 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Nightly Tracking Bugs (Firefox 96)

Firefox

Currently in NIGHTLY channel
Moves to BETA week of December 7, 2021

No results.

0 Total; 0 Open (0%); 0 Resolved (0%); 0 Verified (0%);

fuzzblockers

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
1115005	Consider adding more !cx->isExceptionPending() asserts	[fuzzblocker]		--	NEW
1127525	"Assertion failure: !isIncrementalGCInProgress()" with gczeal(4), verifyprebarriers()	[fuzzblocker]	assertion, regression, testcase	--	NEW

2 Total; 2 Open (100%); 0 Resolved (0%); 0 Verified (0%);

topcrashes

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
668583	crash @ js::gc::ScanRope	[leave open][tbird crash]	crash, steps-wanted, topcrash, topcrash-win	--	NEW	Steve Fink [:sfink] [:s:]
719114	Crash in [@ js::GCMarker::processMarkStackTop ] from heap corruption	[unactionable], ShutDownKill	crash, topcrash-android-armv7, topcrash-mac, topcrash-win	--	NEW
787879	crash in js::SweepBackgroundThings	[js:p1][unactionable], qa-not-actionable	crash, regression, topcrash-mac, topcrash-win	--	NEW
858032	[meta] crashes in EnterBaseline / EnterJit	[file separate bugs for specific reproducible cases][unactionable], ShutDownKill	crash, meta, topcrash-win	P5	NEW
1169247	Crash in js::GCMarker::traverseEdge		crash, topcrash-win	--	NEW
1451925	Crash in shutdownhang | js::GCParallelTask::joinWithLockHeld		crash, nightly-community, topcrash	P5	NEW
1461724	[ARM/ARM64] Crash in js::jit::MaybeEnterJit (SIGILL/SIGSEG on Xperia X/Xperia Z5/Galaxy S6/Galaxy S2 Tab)	[fennec68?]	crash, topcrash	P2	NEW
1472062	[meta] OOM while evicting the nursery	[MemShrink:P2][tbird crash][qa-not-actionable]	crash, meta, top50, topcrash	P3	NEW

8 Total; 8 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Perf Regressions

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
520629	Fix for bug 516862 may cause perf issue	[sg:dos] hang-like, but does end	perf, regression, testcase	P3	NEW	Reed Loden [:reed]
741212	Firefox freezes almost completely and uses 25% of CPU when opening a specific page with a few flash objects.	[js:p2][js:bumped:2][js:ni]	perf, regression	--	NEW
754604	Performance regression with many open tabs.	[js:inv:p1]	perf, regression	--	NEW
797401	Array concatenation 9 times slower in Firefox than in Chrome	[js:p2]	perf, regression	--	NEW
851120	SpiderMonkey regressions in for-loop variants since Firefox 19		perf, regression, reproducible	--	NEW
858876	Escape Goat benchmark performance regressed after landing of Baseline Compiler. (But performance has since improved)		perf, regression	--	NEW
969765	Regression with javascript performance		perf, regression	--	NEW
1037764	Significant performance regression in JSIL test case (array operations?) caused by generational GC		perf, regression	--	NEW
1152893	[meta] Investigate remaining performance regressions in promises due to async stacks		meta, perf, regression	--	NEW
1190723	BitcoinBench perf regressions on SHA, Scrypt, AddressChain, and AES tests		perf, regression	P3	NEW
1207987	3% Linux*/WinXP/MacOS* tp5o memory regression on Mozilla-Inbound-Non-PGO (v.44) on September 22, 2015 from push ad320eee186e1f57aef89c322148cc3d73c3fc91	[talos_regression]	perf, regression	--	NEW
1355096	Regression in performance of Function.prototype.bind and calling bound functions		perf, regression	P3	NEW
1537686	5.46 - 9.91% raptor-tp6m-facebook/instagram/reddit (android-hw-p2-8-0-android-aarch64) regression on push ebf98069b0fbc60e1cfa79ce97f4266c66860bcd (Tue Mar 19 2019)	[arm64:m3]	backlog-deferred, perf, perf-alert, regression, stalled	P2	NEW
1619502	1.12 - 1.22% Base Content JS (windows7-32, windows7-32-shippable) regression on push d93e9fef86dd098bfce6b2e7b16da0366298a4b0 (Fri February 28 2020)		perf, perf-alert, regression	P3	NEW
1645651	Changes in Reddit's comment section JS code makes selecting text slow on Nightly		perf, regression	P2	NEW
1711970	6.97 - 6.96% allrecipes loadtime / allrecipes loadtime (Android) regression on Tue May 11 2021		perf, perf-alert, regression	P5	NEW
1743423	0.92 - 0.9% Base Content JS / Base Content JS + 2 more (Linux, OSX, Windows) regression on Fri November 26 2021		perf, perf-alert, regression	--	NEW	Jon Coppeard (:jonco)

17 Total; 17 Open (100%); 0 Resolved (0%); 0 Verified (0%);

P1 Bugs

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
1353816	[meta] Reduce content process memory overhead from system .jsms	[e10s-multi:+]	meta	P1	NEW
1431826	[Meta] Spectre mitigations for C++		meta	P1	NEW
1500922	[meta] JSVM - Measure JS Engine behaviour related to page load		meta	P1	NEW
1539848	[Meta] Investigate JetStream 2 performance		meta, perf	P1	NEW
1564347	Use a lookup table for String.prototype.toLowerCase and inline it		leave-open	P1	ASSIGNED	André Bargull [:anba]
1573900	[meta] Parser Performance Measurment		meta	P1	NEW
1613592	[meta] Replace IonBuilder with a new MIR builder (WarpBuilder)		meta	P1	NEW
1638669	Share bytecode with Workers			P1	NEW
1644597	Exceptions thrown from undeclared variable access do not have a good column location			P1	NEW
1659972	Start documenting SpiderMonkey Conventions			P1	ASSIGNED	Matthew Gaudet (he/him) [:mgaudet]
1670403	[meta] Cache Stencils across Documents		meta	P1	NEW	Ted Campbell [:tcampbell]
1707066	[meta] Improve performance on ReactDOM		meta	P1	NEW
1712872	[meta] Add ICU4X support to irregexp		meta	P1	NEW	Ashwini Wankhede
1714280	Ion x86_64: parameter-carrying registers forced into spill slots in the presence of calls			P1	NEW	Julian Seward [:jseward]
1715824	[ICU4X] Vendor icu4x to support unicode property escapes			P1	ASSIGNED	Iain Ireland [:iain]
1715976	Compile lazy function off-thread			P1	ASSIGNED	Nicolas B. Pierron [:nbp]
1717710	Private Fields inadvertently tunnel through to the Window object, rather than being stored on WindowProxy as expected			P1	ASSIGNED	Matthew Gaudet (he/him) [:mgaudet]
1721120	Optimize on-main-thread atomization			P1	NEW
1724236	Use JS::Stencil directly in dom::ScriptLoader			P1	NEW	Ted Campbell [:tcampbell]
1726039	Disallow setting private fields on MaybeCrossOrigin objects			P1	NEW
1728273	USER_INACTIVE GCs do not collect all zones		perf-alert	P1	REOPENED	Steve Fink [:sfink] [:s:]
1729501	[meta] SpiderMonkey Benchmarks		meta	P1	NEW
1729502	[meta] SpiderMonkey Site Issues		meta	P1	NEW
1729503	[meta] SpiderMonkey Intermittents		meta	P1	NEW
1729504	[meta] SpiderMonkey Crashes		meta	P1	NEW
1729505	[meta] SpiderMonkey: Build System & Test Suites & Embedding & Internal APIs		meta	P1	NEW
1729506	[meta] SpiderMonkey Frontend		meta	P1	NEW
1729507	[meta] Assemblers / MacroAssemblers / Trampolines		meta	P1	NEW
1729508	[meta] Garbage Collection		meta	P1	NEW
1729509	[meta] Optimizing Compiler		meta	P1	NEW
1729511	[meta] JavaScript Language		meta	P1	NEW
1729513	[meta] SpiderMonkey Fuzzing & Instrumentation & Security		meta	P1	NEW
1729514	[meta] SpiderMonkey Runtime		meta	P1	NEW
1729515	[meta] SpiderMonkey Defects		meta	P1	NEW
1729516	[meta] Just-In-Time Compilers		meta	P1	NEW
1729518	[meta] SpiderMonkey		meta	P1	NEW
1736060	Finish implementation of Import Assertions			P1	ASSIGNED	Jonatan Klemets [:jon4t4n]
1738413	Inline inlinable natives through JSOp::FunCall			P1	ASSIGNED	André Bargull [:anba]
1740481	JS new date show wrong timezone		regression	P1	REOPENED	André Bargull [:anba]
1743449	Replace all `UniquePtr<CompilationStencil>` by `RefPtr<CompilationStencil>`			P1	NEW	Nicolas B. Pierron [:nbp]
1743607	[MIPS64] Fix indirect stubs on mips64 platform		regression	P1	UNCONFIRMED	Zhao Jiazhong

41 Total; 41 Open (100%); 0 Resolved (0%); 0 Verified (0%);

P2 Bugs

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
944260	[jsdbg2] Debugger should provide a GC-insensitive replacement for findScripts			P2	NEW
1008337	[meta] GC memory efficiency tracking bug	[MemShrink:meta]	meta	P2	NEW
1008341	[meta] GC tracking bug for stability issues		meta	P2	NEW
1219128	Assertion failure: inited == hasPrototype(key), at vm/GlobalObject.h:334 with OOM	[jsbugmon:]	assertion, regression, testcase	P2	NEW
1269690	[perf][google suite][google docs] 45.25%(4528ms) slower than Chrome when opening 1 page table content	[platform-rel-Google][platform-rel-GoogleSuite][platform-rel-GoogleDocs][qf:js:investigate]	perf	P2	NEW
1269695	[perf][google suite][google docs] 40.77%(7678 ms) slower than Chrome when opening 200+ pages mix content and to the page end	[qf-][platform-rel-Google][platform-rel-GoogleSuite][platform-rel-GoogleDocs]	perf	P2	NEW
1284975	[meta] Make SpiderMonkey clean on UBSan		meta	P2	NEW
1285181	[perf][google suite][google docs] 22.85%(4,961 ms) slower than Chrome when opening 200+ pages mix content and to the page end	[qf-][platform-rel-Google][platform-rel-GoogleSuite][platform-rel-GoogleDocs]	perf	P2	REOPENED
1299643	[meta] Google Docs performance issues due to javascript execution	[qf:meta][platform-rel-Google][platform-rel-GoogleSuite][platform-rel-GoogleDocs]	meta, perf	P2	NEW
1319562	Crash in js::jit::CreateMIRRootList		crash	P2	NEW
1329900	GC takes a long time on the test case in bug 1269695	[qf:p3]	perf	P2	NEW
1338802	CrossCompartmentWrapper handling is slow on Google Spreadsheet	[qf:p2][platform-rel-Google][platform-rel-GoogleSuite][platform-rel-GoogleSheets]	perf	P2	NEW
1339557	[Meta] Quantum Release Criteria: Figure out why we are so slow on Speedometer v2	[qf:meta]	meta, perf	P2	NEW
1340235	[meta] Virtual function calls are 2.15x slower in wasm compared to asm.js		meta	P2	NEW
1346178	Consider compiling Ion IC code less eagerly	[qf:p3]	perf	P2	NEW
1346884	[prettify] Performance degradation for minified code in firefox developer edition			P2	UNCONFIRMED
1349924	Inline through polymorphic wrapper functions	[qf:p3]	perf	P2	REOPENED
1353284	On google sheets the slider is moving but the page scrolls slowly [Windows with touchscreen]	[gfx-noted][platform-rel-Google]		P2	NEW
1375565	GC: Do nursery allocation for external strings	[qf:p3]	perf	P2	NEW
1376904	[meta] Stop doing full GCs		meta	P2	NEW
1380129	[meta] Support AArch64 in ion		meta	P2	NEW
1385120	Speedometer Ember benchmark spends a lot of time in toString().		perf	P2	NEW
1385200	Whole Firefox crash in win10 x86		crash, testcase	P2	NEW
1386104	400ms onload jank in this React testcase (Chrome: 120ms)	[qf:p3]	perf	P2	NEW
1386390	Crash in JS::WeakCache<T>::lookupForAdd		crash, regression	P2	NEW
1389288	IonMonkey: emberperf "get" benchmark fails to inline String.split().		perf	P2	NEW
1392044	Content process stuck on https://cdn.ampproject.org/amp4ads-host-v0.js Z.prototype.processMessage			P2	NEW
1393712	for-await-of with Async Generator is slow	[js:perf][qf:p3]	perf	P2	NEW
1396933	Error message for strict mode functions' and arguments' properties is misleading	[js:correctness]		P2	REOPENED
1400237	[meta] GC crashes		meta	P2	NEW
1400641	Crash in FinalizeTypedArenas<T>		crash	P2	NEW
1401481	[Crash in shutdownhang | js::Thread::join] MOZ_CRASH(Shutdown too long, probably frozen, causing a crash.)		crash, crashreportid	P2	NEW
1402265	Better estimate CPU resources and apportion HelperThreads to tasks			P2	NEW
1402700	Crash in js::InitFunctionEnvironmentObjects		crash	P2	NEW
1402706	Crash in js::jit::JitActivation::JitActivation		crash	P2	NEW
1407691	Run away memory use sending ArrayBuffers to workers	[MemShrink:P3]		P2	NEW
1409441	Fix some perf issues on the EnterJit path		leave-open, perf	P2	ASSIGNED	Jan de Mooij [:jandem]
1409953	Make PCToLineNumber stop hanging the Gecko profiler	[js:tech-debt][js:testability]		P2	NEW	Jason Orendorff [:jorendorff]
1410238	Postpone malloc accounting of nursery strings until they are tenured			P2	ASSIGNED	Steve Fink [:sfink] [:s:]
1419779	Crash in js::jit::ReleaseProcessExecutableMemory			P2	NEW
1420463	Intermittent nightly content crashes on youtube video			P2	NEW
1424057	Excessive time spent running JS (in "transitionHandler" function), when clicking rightarrow on Facebook photo viewer	[qf:p2]		P2	NEW
1425086	I suspect the number of minor GCs per majorGC is reported incorrectly in the profiler or documented badly			P2	NEW
1425986	--disable-ion should disable wasm signal handler			P2	NEW
1426034	Access to `undefined` is slow in modules loaded via require()			P2	NEW
1427739	Map/Reduce slow compared in Firefox Nightly vs Chrome	[qf:p2]	nightly-community, perf	P2	NEW
1428972	RexBench is slower than Chrome/WebKit	[qf:p2]	perf	P2	NEW
1431142	Crash in xul!icu_58::DecimalFormat::updatePrecision (likely OOM)		crash, csectype-nullptr, testcase	P2	NEW
1431220	SpiderMonkey runs `source-map` library benchmarks slower and with more variation than V8 and JSC do			P2	NEW
1431831	[Meta] Spectre mitigations for C++ bounds checks reachable from JS			P2	NEW
1436427	Consider optimizing MBoundsCheck followed by MSpectreMaskIndex			P2	NEW
1437130	Add retpoline macro			P2	NEW
1440000	Code on https://flow.org/try is a lot slower in Firefox than in Chrome, causes hangs			P2	NEW
1440748	StructuredClone stack overflow reading invalid data			P2	NEW
1441052	Don't do full grey-node checking in local debug builds			P2	NEW
1445020	Slow shutdown of debug Firefox (~30s) builds after loading http://talend.surge.sh	[qf-]		P2	NEW
1447701	Find better solution for making JSID_VOID constexpr (and fix SM Rust breakage)			P2	NEW
1451800	[meta] Record Execution Traces			P2	ASSIGNED	Nicolas B. Pierron [:nbp]
1452171	Nondeterminism in hazard analysis			P2	NEW	Steve Fink [:sfink] [:s:]
1454585	[Meta] Improve IonBuilder perf		meta	P2	NEW
1454917	[meta] SpiderMonkey bytecode abstraction			P2	NEW
1454919	Move bytecode iterators and other gadgets to a common header			P2	NEW
1458035	firefox 52 segfault in js			P2	UNCONFIRMED
1461724	[ARM/ARM64] Crash in js::jit::MaybeEnterJit (SIGILL/SIGSEG on Xperia X/Xperia Z5/Galaxy S6/Galaxy S2 Tab)	[fennec68?]	crash, topcrash	P2	NEW
1462745	Don't apply Annex-B block function semantics if an outer block function is present			P2	NEW
1464274	(msan) use of uninitialized value in HashTableEntry::isFree()			P2	NEW	Jeff Walden [:Waldo]
1464275	(msan) use of uninitialized value in js::CombinePlainObjectPropertyTypes()			P2	NEW
1464277	(msan) use of uninitialized value in DoTypeMonitorFallback()			P2	NEW
1464281	(msan) use of uninitialized value in CreateRegExpMatchResult			P2	NEW
1467697	Loading page is x2 slower than chrome	[qf:p2:pageload]	parity-chrome, perf	P2	NEW
1471438	[meta] Provide more performance info to the gecko profiler		meta	P2	NEW
1474543	Implement WritableStream		dev-doc-needed	P2	NEW	Ted Campbell [:tcampbell]
1478104	Slow typing (1-5s delay) for GDocs with many active contributors	[qf:js:investigate]		P2	NEW
1485078	Gigabytes of script-sources memory on datascience.com	[fxperf:-][MemShrink:P2]		P2	NEW
1489826	Crash in js::jit::RangeAnalysis::truncate	[#jsapi:crashes-retriage]	crash	P2	NEW
1490847	[meta] Long-standing Ion Compilation Time Issues	[qf:p2]	meta	P2	NEW
1490849	Off-Main-Thread Baseline Compilation	[qf:p2]		P2	NEW
1491204	Coalleace nursery tests per basic block			P2	NEW
1493582	Crash in js::HeapSlot::post		crash	P2	NEW
1494271	Crash in js::TenuringTracer::traceObject	qa-not-actionable	crash	P2	NEW
1495355	Add explicit GC tuning modes (low memory, tab in background, etc)	[MemShrink:P2]		P2	NEW
1496514	Long stalls (10-15 seconds) while paging down on load of very large Google doc	[qf:p2]		P2	NEW
1498484	Sketchfab frame rate is too slow in FxR on Oculus Go	[geckoview:fxr:p1][webvr][qf:js:investigate]		P2	NEW
1498589	[BinAST] Measure total parsing duration for Binary AST resources			P2	NEW
1499538	Reduce the overhead of JS helper threads			P2	NEW
1500481	JSVM - Simplify dictionary object representation and sparse arrays with object-held hashtables			P2	NEW
1500898	Free LifoAlloc oversize list.	[overhead]		P2	NEW
1501377	Tracelogger: meta bug for integrating tracelogger with gecko profiler			P2	NEW	Denis Palmeiro [:denispal]
1501438	[meta] Use XPCOM thread pools for Spidermonkey		meta	P2	NEW
1503150	Merge Chromium change to zlib for arm optimization			P2	NEW	Makoto Kato [:m_kato]
1503319	[meta] Streams		meta	P2	NEW
1504468	Either ban cross-domain stream readers or write tests for them			P2	NEW
1505192	twitch.tv site loads slow compared to Chrome	[qf:p2:pageload]		P2	NEW
1505589	Make Profiler Counters usable within the JavaScript Engine			P2	ASSIGNED	Randell Jesup [:jesup] (needinfo me)
1506263	Local builds don't update BUILDID resulting in cache corruption (XDR)			P2	NEW
1506681	Bounds-check autoAllocateChunkSize before using it			P2	NEW
1508121	Crash in js::jit::LIRGenerator::visitInstructionDispatch	[#jsapi:crashes-retriage]	crash	P2	NEW
1511615	Intermittent Tier 2 Android tests/jit-test/jit-test/tests/ctypes/conversion-finalizer.js | Segmentation fault (code 139, args "--ion-eager --ion-offthread-compile=off --ion-check-range-analysis --ion-extra-checks --no-sse3 --no-threads") [0.3 s]	[geckoview:p2][leave-open]	intermittent-failure	P2	NEW
1512301	Investigation of Baseline Compilation granularity			P2	ASSIGNED	Bas Schouten (:bas.schouten)
1512430	Ryzen crashes in irregexp (more cores -> more crashes)			P2	NEW
1514284	Add bytecode counters to estimate the speed of execution of Interpreters / Baseline / IonMonkey.			P2	NEW
1514851	Number.prototype.toLocaleString is slow			P2	NEW
1515380	[meta] Shrink GC nursery on background tabs	[overhead:800k]	meta	P2	NEW
1516775	Optimize lookups on cross-realm WindowProxies			P2	NEW
1517424	Make sure we have tests for WindowProxy lookups involving navigation and document.domain			P2	NEW
1517534	Poor performance of simple "vector" operations on arrays	[qf:p3:responsiveness]	perf	P2	NEW
1517916	Skeletal Animation: Slow (FPS) on Firefox compare to Chrome	[qf:p3:responsiveness]	perf	P2	NEW
1518857	provide optimized implementations of float modulus	[qf:p3:responsiveness]		P2	NEW
1523564	Disabling the baseline jit makes us crash almost immediately			P2	NEW
1525260	RSA Encrypt is VERY SLOW in firefox	[qf:p3:responsiveness]	perf	P2	UNCONFIRMED
1526993	[meta] ARM64: Post ARM64 Ion Support - Issues/Failures to address		meta	P2	NEW
1526995	[meta] ARM64: Post ARM64 Ion Support - Windows-on-ARM Test Failures		meta	P2	NEW
1528037	Crash in [@ js::jit::Assembler::GetPtr32Target]		crash	P2	NEW
1528986	Investigate OOM crashes in DevTools tests		crash	P2	NEW
1529343	JavaScript algebra calculation on FireFox is slower than on Chrome	[qf:p3:responsiveness]	perf	P2	NEW
1529514	[ARM64] Bing maps is slowing down the browser and remains stuck when zooming out using touchscreen			P2	NEW
1529651	Losing Global Variable value in version 64.0		stalled, testcase-wanted	P2	UNCONFIRMED
1532654	Teach the jit-test harness about the Android log			P2	NEW
1533065	Support external manifests for test262 PRs and local files.			P2	NEW
1537686	5.46 - 9.91% raptor-tp6m-facebook/instagram/reddit (android-hw-p2-8-0-android-aarch64) regression on push ebf98069b0fbc60e1cfa79ce97f4266c66860bcd (Tue Mar 19 2019)	[arm64:m3]	backlog-deferred, perf, perf-alert, regression, stalled	P2	NEW
1537906	Make ICScript/TypeScript allocation faster		perf	P2	NEW
1538386	Differential Testing: Different output message involving __proto__		testcase	P2	NEW
1538408	Add StructuredClone tests for Big(U)Int64Arrays			P2	NEW
1539500	Remove JSMSG_OUT_OF_MEMORY			P2	NEW
1540090	Investigate JetStream 2 code-load tests		perf	P2	NEW
1540646	Figure out why JetStream 2's async-fs test is slow		perf	P2	NEW
1540935	Fix Ion resume point overhead		perf	P2	NEW
1544036	Baseline ICs show up in the profiler as "Native Code" not "Baseline" code.			P2	NEW
1544097	SUMMARY: AddressSanitizer: access-violation z:\build\build\src\js\src\jit\JitcodeMap.cpp:412 in js::jit::JitcodeGlobalTable::lookupForSamplerInfallible(void *,struct JSRuntime *,unsigned __int64)			P2	NEW
1547520	[jsdbg2] Debugger.Frames are dumb about suspended generators			P2	NEW
1548356	Hash the XDR transcode buffer			P2	NEW
1548775	Stop eagerly allocating profile strings			P2	NEW
1549914	js::GetGeneratorObjectForFrame returns nullptr after generator object has been created			P2	NEW
1552900	ICU OOM error handling is broken in some cases			P2	NEW
1555169	Differential Testing: Different output message on ARM32		sec-other, testcase	P2	NEW
1555522	Enable JavaScript Startup Bytecode Cache for DevTools code	[qf:p3:responsiveness]		P2	NEW
1556604	Allow structured cloning of native error types			P2	NEW	Tom Schuster [:evilpie]
1557668	[BinAST] Context 0.1 parser			P2	NEW
1559759	Date picker verification fails on dates after 12th of the month		parity-chrome, parity-edge, parity-opera, regression	P2	NEW
1564602	[jsdbg2] Separate Web Assembly and JavaScript Debugger.Script instances			P2	NEW
1564825	Misleading Syntax Error when re-declaring an ES6 class			P2	REOPENED
1568422	fetch cannot be aborted by AbortController(AbortSignal)			P2	UNCONFIRMED
1570398	Streams algorithms are not 100% up-to-date with the current spec			P2	NEW
1572562	[jsdbg2] DebuggerWeakMap instances cost more in code size than they should.			P2	NEW
1574163	Crash in [@ js::frontend::PerHandlerParser<T>::propagateFreeNamesAndMarkClosedOverBindings]		crash, regression	P2	NEW
1575024	[jsdbg2] Debugger should have a function to reset all current hooks/state	[debugger-mvp]		P2	NEW
1575556	Update vendored Inflector crate to 0.11.4			P2	NEW
1576999	"new Function" cloning of introducer URLs is slow			P2	NEW
1577549	Evaluate the distribution of slot counts for ArrayBuffers			P2	NEW
1578396	Use SIMD and avoid intermediate allocations in impl FromJSValConvertible for String			P2	NEW
1579796	Garbage builds up when running JS reftests			P2	NEW
1586089	Implement the Map.prototype.upsert proposal		dev-doc-needed	P2	NEW
1588127	Make it harder to misuse GC hash tables			P2	NEW
1588130	AttachFinishedCompressions operates per-runtime but is called per-sweep group			P2	NEW
1588340	Spidermonkey does not build with --disable-shared-js		leave-open	P2	ASSIGNED	Christian Holler (:decoder)
1589523	include async callers in captured stacks (SavedFrame chains) for free			P2	NEW
1589714	Add web platform tests for weak references			P2	REOPENED
1589906	[jsdbg2] Breakpoint handlers can fire when they should not, in rare situations			P2	NEW
1590460	Remove the third flags argument from JS_FN, split JS_CTOR out of it (and maybe rename it)			P2	NEW
1592392	Temporary intermittent browser hang in js::GCParallelTask::join() on Windows 10		hang	P2	UNCONFIRMED
1595986	[jsdbg2] Force return completions are a weird special case currently as neither a termination nor an exception			P2	NEW
1596984	[jsdbg2] Debugger::hasAnyLiveHooks doesn't check for `onNativeCall`			P2	NEW
1597522	Gmail login page loading is slower than Chrome	[qf:p1:pageload]		P2	NEW
1597572	null pointer passed as argument 2, which is declared to never be null in modules/zlib/src/trees.c:873		csectype-undefined, testcase	P2	NEW
1598384	13 seconds of jank when loading https://data.firefox.com/dashboard/hardware	[qf:p2:pageload]		P2	NEW
1598786	Figure out how BytecodeLocation shows up in the JSAPI public interface, and see if it's removable			P2	NEW
1599295	Intermittent http://10.7.205.220:8854/jsreftest/tests/jsreftest.html?test=non262/TypedArray/<test name> | No test results reported. (SCRIPT)	[stockwell unknown]	intermittent-failure	P2	REOPENED	Steve Fink [:sfink] [:s:]
1599542	Support upgrading a SameProcessDifferentThread structured clone buffer to a DifferentProcess buffer			P2	NEW
1599909	Analyze baseline ICs to inform strategies for eventual IC -> MIR compilation			P2	NEW	Chris Fallin [:cfallin]
1600366	Make FunctionBox initialization verifiable and ensure correctness			P2	NEW
1602780	Simplify for-in iterator bytecode			P2	NEW
1603070	The shell has no way to start a new task			P2	NEW
1603575	[jsdbg2] Debugger cannot follow cross-compartment promise resolutions			P2	NEW
1604121	Rewrite and optimize source notes			P2	NEW
1606600	Consider moving GC hooks out of JSClassOps			P2	NEW
1607222	Re-add 'module' reftest marker to async-generator-declaration-in-modules.js			P2	NEW
1608027	JS Errors from new Error are not correctly muted			P2	NEW
1608430	Remove all uses of toSource/uneval			P2	NEW
1608891	Assertion failure: observing, at debugger/Debugger.cpp:3182	[bugmon:bisect]	assertion, bugmon, crash, regression, testcase	P2	ASSIGNED	Ted Campbell [:tcampbell]
1610736	Uncomment calls to moz_dispose_arena			P2	NEW	Mike Hommey [:glandium]
1611459	ErrorReport::populateUncaughtExceptionReportUTF8VA() can result in a null filename			P2	NEW
1612057	js engine assumptions incompatible with x86 5-level-paging			P2	UNCONFIRMED
1613351	Assertion failure: !mEntered, at dist/include/mozilla/Vector.h:465 with Debugger	[bugmon:confirmed]	assertion, bugmon, regression, testcase	P2	ASSIGNED	Ted Campbell [:tcampbell]
1615307	Crash in [@ OOM | unknown | js::AutoEnterOOMUnsafeRegion::crash | js::gc::GCRuntime::mergeRealms]		crash	P2	NEW
1616378	Reimplement Function.prototype.caller			P2	NEW
1616543	Rust getters and setters for private values are broken			P2	NEW
1618391	Avoid parsing and compiling self-hosted code during startup (takes 90ms on Android Moto G5)	[qf:p2:responsiveness]		P2	NEW
1619080	Smiley-Panel of WhatsApp-Web takes 1-2s to appear			P2	UNCONFIRMED
1619424	nextdoor.com: 64% longer jank in Fenix Nightly versus Chrome			P2	NEW
1620228	isObservableArgumentSlot() doesn't match IsSloppyNormalFunction			P2	NEW
1620446	Return UniquePtr-like thing from smoosh bindings, instead of raw struct that needs manual free	[smooshmonkey-reserve]		P2	NEW
1621995	WarpBuilder optimization ideas			P2	NEW
1622192	Clean up Ion and nursery allocation invariants			P2	NEW
1622824	Investigate why SM(cgc) jobs are so slow on Windows.			P2	NEW	Rob Thijssen [:grenade (EET/UTC+0300)]
1623169	Create js::stencil namespace inside SharedStencil.h			P2	NEW
1623261	Use the type system more to improve thread safety in WarpBuilder			P2	NEW
1624449	Muted errors still have an URL/filename			P2	NEW
1626251	Consolidate implementations of IterableToArray			P2	NEW
1626294	Ion bug with function.arguments + aliased formals			P2	NEW
1626719	Firefox Nightly hangs when displaying a Grafana	[qf:p3:responsiveness]	nightly-community	P2	NEW
1626854	WarpBuilder: re-enable and re-evaluate copy-on-write arrays			P2	NEW
1628211	WarpBuilder: potential GC optimizations			P2	NEW
1629897	Warp: improve MIR backend optimizations			P2	NEW
1633217	Object iteration is slower than the competition (3-4 times)			P2	UNCONFIRMED
1635176	Run js ref tests in COOP+COEP headers on treeherder			P2	NEW
1637618	Replace the ELEMENT_PROPERTY_SLOT in the ScriptSourceObject with a callback			P2	NEW	Denis Palmeiro [:denispal]
1637735	[Github] Very slow page loading on reddit (around 4x slower than Chromium)	[qf:p1:pageload]		P2	NEW
1639153	Optimize indirect calls by not pessimizing same-instance calls		leave-open, perf-alert	P2	ASSIGNED	Dmitry Bezhetskov
1639740	Deselecting rows in gsheets takes 1s+ main thread plus severe delay	[qf:p2:resource]	perf	P2	NEW
1640284	[meta] Create a tool for easily discovering and diagnosing costly CacheIR stubs		leave-open, meta	P2	NEW	Caroline Cullen [:caroline]
1643369	Crash in [@ js::jit::MConstant::MConstant]		crash, regression	P2	NEW
1643560	High memory usage on Facebook	[qf:p2:resource]		P2	UNCONFIRMED
1644760	Hit MOZ_CRASH(This promise should never be rejected) at shell/ModuleLoader.cpp:205 with dynamic import	[bugmon:update,bisected,confirmed]	assertion, bugmon, crash, regression, testcase	P2	NEW
1645651	Changes in Reddit's comment section JS code makes selecting text slow on Nightly		perf, regression	P2	NEW
1646039	[Meta] Warp Fuzzing		meta	P2	NEW
1647847	Huge lag typing into a slack popup	[qf:p2:responsiveness]		P2	NEW
1652868	Make sure Private Fields don't violate the security assumptions around Window, WindowProxy and Location Objects			P2	NEW
1653088	Performance issue on voice.google.com - Site can hang from seconds to minutes	[qf:responsiveness:p1]		P2	NEW
1653267	Unnecessary CheckAliasedLexical instruction when accessing a private field			P2	NEW
1653920	Add a CacheIR op that matches MToIntegerInt32			P2	NEW
1654180	Reuse CacheIRCompiler's ArrayPush code in Warp			P2	NEW
1656469	CacheIRWriter::loadArgumentFixedSlot's flags argument should not be optional			P2	NEW
1661491	Frame dropping due to GC when looking at https://arewefenixyet.com	[qf:p2:responsiveness]		P2	NEW
1661695	Use --fast-warmup for shell tests		leave-open	P2	ASSIGNED	Jan de Mooij [:jandem]
1662110	[meta] Support progressive compilation of CompilationStencil		meta	P2	ASSIGNED	Nicolas B. Pierron [:nbp]
1662149	[meta] Use stencil for selfhosted.js		meta	P2	NEW
1662344	Warp: mark some MIR instructions as guard			P2	NEW
1663955	[meta] Stencil Phase 2 Capabilities		meta	P2	NEW
1663956	[meta] Stencil Phase 2 Use-Cases		meta	P2	NEW
1666141	Assertion failure: makeWritable(), at jit/JitRealm.h:759	[bugmon:update,bisected,confirmed]	assertion, regression, testcase	P2	NEW
1666569	Warp and CacheIR DOM optimizations			P2	NEW
1666747	Partially OOB unaligned stores on ARM, ARM64, x86(?) may write partial data at the end of the heap		leave-open	P2	NEW
1669091	Experiment with adding a typed LoadDenseElement variant			P2	NEW
1669376	Extremely elevated memory usage by Facebook			P2	UNCONFIRMED
1669806	Optimize DOM getters with polymorphic receivers			P2	NEW
1669942	Optimize charCodeAt/charAt on ropes			P2	NEW
1670301	Add telemetry for how many JSScripts are delazified.			P2	NEW
1672272	High memory use and slow performance on Windows			P2	NEW
1675837	Lots of memory used by JS classes on Facebook			P2	REOPENED
1679719	High memory use for JS classes on TechRadar			P2	UNCONFIRMED
1680195	Facebook Next Photo appears to be 2x as slow compared to Chrome	[platform-rel-facebook][responsiveness]		P2	NEW
1680904	Massive Javascript performance regression with Firefox 83 / warp			P2	UNCONFIRMED
1681181	High memory use for JS classes on imgur and Reddit			P2	NEW
1682828	Super slow input (due to some heavy JS on the page)			P2	NEW
1682854	Crash in [@ JSStructuredCloneWriter::startWrite]	[not-a-fission-bug], qa-not-actionable	crash	P2	NEW
1683140	[meta] Memory leaks		meta	P2	NEW
1683978	Leaks a ton of memory on Facebook.com after using for a while			P2	UNCONFIRMED
1684347	EatsAtLeastFromLoopEntry is incorrect for quantifiers containing lookahead assertions		regression, testcase	P2	NEW
1685082	Chrome refreshes news sites ~2x faster than Firefox			P2	NEW
1685127	[meta] Warp: Performance regressions		meta	P2	NEW
1686592	Responsiveness: On Twitter, switching from Home to Explore takes 2.5x as long as in Chrome	[qf:p1:responsiveness]		P2	NEW
1686775	Consider delazifying small inner functions with their enclosing functions			P2	NEW	Ted Campbell [:tcampbell]
1687964	Cleanup initial-prototype lookup for JSFunctions			P2	NEW
1688187	Use inline assembly to optimize ToInt32 on Aarch64 Apple.			P2	NEW
1689328	IonMonkey: BacktrackingAllocator: use loop depths in computation of spill costs (weights)			P2	NEW	Julian Seward [:jseward]
1689434	Experiment with length-3 TaggedParserAtomIndex in Parser			P2	NEW
1692855	Warp can't elide MLexicalCheck			P2	NEW
1692856	Transition from GuardSpecificFunction to GuardFunctionScript breaks trial-inlining		regression	P2	NEW
1694067	Install a telemetry probe for JS parse errors on UI resources			P2	NEW	Zibi Braniecki [:zbraniecki][:gandalf]
1696412	GC globalArrayLargeArray microbenchmark triggers very long minor GCs			P2	NEW
1698095	Consider preserving a LifoAlloc chunk for common delazification stencil case			P2	NEW
1698102	Revisit SpiderMonkey pref management			P2	NEW
1699376	Google sheet loading hangs with half of the screen black	[qf:p1:pageload]		P2	NEW
1699830	Web content process consumes 2GB of memory when browsing on Facebook			P2	REOPENED
1700291	[meta] Pretenure long-lived allocations		meta	P2	NEW	Jon Coppeard (:jonco)
1701197	[meta] wasi port		meta	P2	NEW
1701936	Annotate GCs with URL			P2	NEW
1701945	Ryzen startup crash in [@ js::jit::MoveResolver::resolve] (= with cpu family 23 model 1 stepping 1)		crash	P2	NEW
1701951	Record whether a GC slice is running in idle time			P2	NEW
1701956	Scrolling twitter has more checkerboarding than Chrome	[qf:p2:responsiveness]		P2	NEW
1708779	Consider unserializing directly to the Tenured generation when the input is too big for the nursery	[qf-]		P2	NEW
1711284	gigabytes of JS classes on Twitter			P2	UNCONFIRMED
1713166	Crash in [@ IPCError-browser | ShutDownKill | js::GCMarker::processMarkStackTop]		crash, nightly-community	P2	NEW
1714072	[meta] Massive memory use + wasm compilation time with console open		meta	P2	NEW
1714589	Windows spidermonkey sometimes exceeds its max-run-time			P2	NEW
1715966	Add an equivalent of CompileLazyFunction which does not depends on GC-things.			P2	NEW
1715972	CompileLazyFunction should check if a pre-compiled stencil exists.			P2	NEW
1717597	Twitter feeds paint very slowly			P2	UNCONFIRMED
1720480	Consider enabling exemplar cities again			P2	ASSIGNED	André Bargull [:anba]
1720747	[meta] Implement matrix multiply intrinsic for Firefox Translations		meta	P2	NEW
1722102	Import intgemm library as third_party/ sources			P2	ASSIGNED	André Natal
1722205	Output to JS console stops working			P2	UNCONFIRMED
1722737	Re-implement checks for missing self-hosting intrinics			P2	NEW
1722802	Add JSAPI functions to create JS modules w/ custom exports			P2	UNCONFIRMED	fitzgen
1724119	Avoid using pinned atoms in JS debugger		good-first-bug	P2	NEW
1724213	Investigating replacing pinned atoms with permanent atoms			P2	NEW	Jon Coppeard (:jonco)
1727191	Add Ion CacheIR tools to the JavaScript shell			P2	NEW	Michael Smith [:mismith] (non-bmo mail: mds009@eng.ucsd.edu)
1732362	Allow JS Exception Handler setup to be disabled			P2	NEW
1732932	Investigate improving Heap<T> read barrier			P2	NEW
1735591	Large GC slice budget overruns in hydration-preact benchmark (found from BHR)			P2	NEW
1735695	OOM for JS::CreateModuleRequest isn't handled correctly in ScriptLoader::FinishDynamicImport		regression	P2	NEW
1738566	Scrolling and dragging a section of graph on perfherder spends a lot of time in JS			P2	NEW
1738934	Make machine code caching policies explicit and meaningful			P2	NEW
1741403	Add a Stencil caching mechanism			P2	NEW
1741404	Clone ExtensibleCompilationStencil			P2	NEW
1741405	Create delazify off-thread task			P2	NEW
1741807	wasm-via-Ion on x64/arm64: select `(x AND64 y) == 0` into a single `test` instruction			P2	NEW	Julian Seward [:jseward]
1742053	Refactoring of call_indirect optimization patch		leave-open	P2	REOPENED	Lars T Hansen [:lth]
1742592	Assertion failure: part.second > beginIndex, at js/src/builtin/intl/ListFormat.cpp:299	[bugmon:update,bisected,confirmed][invalid assertion]	assertion, bugmon, regression, testcase	P2	NEW	Yoshi Cheng-Hao Huang [:allstars.chh][:allstarschh]
1742639	Document CompilationStencil / ExtensibleCompilationStencil relationship			P2	NEW	Ted Campbell [:tcampbell]
1742930	[meta] Optimize call_indirect		meta	P2	NEW
1743087	Intermittent js\src\jit-test\tests\wasm\builtin.js | z:\task_163791564181259\src\js\src\jit-test\lib\wasm.js line 35 > WebAssembly.Module:118:1 RuntimeError: indirect call to null (code 3, args "--ion-eager --ion-offthread-compile=off --more-compartment		intermittent-failure, regression	P2	ASSIGNED	Lars T Hansen [:lth]
1743269	Intermittent js\src\jit-test\tests\wasm\table-gc.js | z:\task_163805684413037\src\js\src\jit-test\tests\wasm\table-gc.js line 203 > WebAssembly.Module:56:1 RuntimeError: indirect call to null (code 3, args "--no-baseline --no-blinterp --wasm-compiler=base		intermittent-failure, regression	P2	ASSIGNED	Lars T Hansen [:lth]

303 Total; 303 Open (100%); 0 Resolved (0%); 0 Verified (0%);

[js:p1] Bugs

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
757004	"Assertion failure: !cx->isExceptionPending()" with nearScriptStackLimit	[js:p1][js:bumped:2][js:ni]	assertion, regression, testcase	--	NEW
787879	crash in js::SweepBackgroundThings	[js:p1][unactionable], qa-not-actionable	crash, regression, topcrash-mac, topcrash-win	--	NEW
795208	Invalid Instruction in PushActiveVMFrame on armv6	[js:p1]		--	NEW
957798	[jsdbg2] Debugger.Script and Debugger.Source objects should not pretend dynamically generated scripts have urls	[js:p1]		--	NEW

4 Total; 4 Open (100%); 0 Resolved (0%); 0 Verified (0%);

[js:p2] Bugs

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
741212	Firefox freezes almost completely and uses 25% of CPU when opening a specific page with a few flash objects.	[js:p2][js:bumped:2][js:ni]	perf, regression	--	NEW
750947	IonMonkey: Optimize Uint32 values	[js:p2][games:p?][ion:t][shumway:p1]	perf	--	NEW
753389	Massive buffer allocated during ecma_5/RegExp/regress-617935.js	[js:p2]		--	NEW
753734	Generating JS Warnings is very slow, profile shows js::mjit::ExpandInlineFrames and NS_ScriptErrorReporter	[js:p2]		--	NEW
755574	Do not GC when toggling debug mode	[js:p2]		--	NEW
760095	Move canonical standard class objects from slots on the global to members of the Realm	[js:p2]		--	NEW
763713	High CPU usage and slowdowns while typing into YouTube comment field	[js:p2][js:bumped:1] [platform-rel-Youtube]		--	NEW
774119	cpg makes DOS emulator demo very very slow	[js:p2]	regression	--	NEW
774753	"document instanceof Object" -> false in a sandbox (Web Console)	[js:p2]		--	NEW
782072	Regression in browser process shutdown time	[Snappy][js:p2]	regression, reproducible	P3	NEW	Nathan Froyd [:froydnj]
783895	Assertion failure: src->length() > 0 && chars[0] == '(', at js/src/jsfun.cpp:632 reading source of function whose source file has since changed	[js:p2]	assertion	--	NEW
783910	Special undefined value that allows tracking where a missing property was dereferenced	[js:p2]		--	NEW
786014	Crash in js::gcstats::Statistics::printStats() + 462 (Statistics.cpp:497)	[js:p2]		--	REOPENED
787851	C-like corrections should help, not hurt	[js:p2]		--	NEW
789583	Typed array APIS that return data pointers should un-inline the data	[js:p2]		--	NEW
789598	Too much time spent in analyzeBytecode in gmail onfocus handler.	[js:p2] [platform-rel-Google] [platform-rel-Gmail]		--	NEW
797401	Array concatenation 9 times slower in Firefox than in Chrome	[js:p2]	perf, regression	--	NEW
803837	Clearing object properties by setting property	(works on nightly)[js:p2]	testcase	--	NEW
839726	Get rid of SuppressDeletedProperty and compartment->enumerators	[js:p2]		--	NEW
976688	Add intrinsic for comparing known atoms that is optimized by ion into a pointer comparison	[js:p2]	perf	P5	NEW
977403	Assertion failure: ToInteger(t) == t, at e:\dev\mozilla\central\js\src\jsdate.cpp:278	[js:p2]	assertion	--	NEW
977658	Windows PGO builds much slower than non-PGO builds on "cold" code	[js:p2]	perf	--	NEW
978245	Consolidate property-defining code	[js:p2]		--	NEW

23 Total; 23 Open (100%); 0 Resolved (0%); 0 Verified (0%);

JS Features

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
568953	[meta] ES6 modules	[leave open]	compat, dev-doc-needed, feature, meta	--	NEW
723959	ES6: Tail-call optimization in IonMonkey	[js:p3]	feature	P3	NEW
837314	Implement ES6 classes	[DocArea=JS]	dev-doc-needed, feature	--	NEW
962053	Implement ES Realms		dev-doc-needed, feature	--	NEW

4 Total; 4 Open (100%); 0 Resolved (0%); 0 Verified (0%);

JS Meta Bugs

Full Query

ID	Summary	Whiteboard	Keywords	Priority	Status	Assigned to
557354	[meta] Improve JSON performance		meta, perf	--	NEW
568953	[meta] ES6 modules	[leave open]	compat, dev-doc-needed, feature, meta	--	NEW
608741	[meta] Type inference JIT integration		meta	--	NEW
609924	[meta] JavaScript watchpoints should be improved for js::dbg2		meta	--	NEW
616927	[meta] enable concurrent per-compartment GC in the background		meta	--	NEW
622261	[meta] Error message/reporting bugs & enhancements		meta	--	NEW
636940	[meta] Improve testing levels in SpiderMonkey		meta	--	NEW
650180	[meta] Build a new optimizing compiler		meta	--	NEW
652780	[meta] Tracking test262 issues		meta	--	NEW
674274	[meta] ARM JavaScript performance improvements		meta, mobile, perf	--	NEW
682573	[meta] Crash @ js::Interpret	[js:waitingforinfo]	crash, meta	--	NEW
694100	[meta] Tracking bug for ECMAScript 6 in SpiderMonkey		meta	--	NEW
705294	[meta] IonMonkey performance optimizations		meta, perf	--	NEW
723783	[meta] JS heap and CC heap logging improvements		meta	--	NEW
767238	[meta] Make Emscripten-generated code as fast as possible	[js:t]	meta	--	NEW
784288	[meta] Self-host JS builtins	[js:t]	meta	--	NEW
806638	[meta] IonMonkey: Fix V8 Benchmark Performance		meta	--	NEW
807159	[meta] IonMonkey: Fix Octane benchmark performance		meta	--	NEW
807162	[meta] IonMonkey: Fix PdfJs performance (octane benchmark)	[ion:p1]	meta	P3	NEW
807854	[meta] Profile JS shell benchmarks with the Gecko profiler.		meta	--	NEW
831510	[meta] Fix gbemu.js performance (octane benchmark)		meta	--	NEW
835306	[meta] IonMonkey: Improve property accesses.		meta	P3	NEW	Nicolas B. Pierron [:nbp]
837921	[meta] SpiderMonkey standalone embedding		meta	--	NEW
858032	[meta] crashes in EnterBaseline / EnterJit	[file separate bugs for specific reproducible cases][unactionable], ShutDownKill	crash, meta, topcrash-win	P5	NEW
860923	[meta] "use asm" should not affect code speed		meta	--	NEW
889783	[meta] Performance on JSIL-compiled code	[js:t] [js:perf]	meta	--	NEW
897962	[meta] 0.a.d. performance fixes		meta	--	NEW
898608	[meta] GC: Drive static analysis of unsafe references to zero		meta	--	NEW
900120	[meta] Float32 support in Spidermonkey	[games]	meta	--	NEW
912928	The number of crash and assertion OOM bugs is too damn high [meta]		meta, sec-want	--	NEW
994253	[meta] Extend and improve JS crash diagnostics		meta	P3	NEW
996602	[meta] Centralize common interface of the MacroAssembler.		meta	P3	NEW
1000520	[meta] [jsdbg2] Debugger's performance impact should be less		meta	--	NEW
1003801	[meta] Recover all non-effectful instructions.		leave-open, meta	P5	NEW
1008333	[meta] GC tracking bug for performance issues		meta, perf	P3	NEW
1008337	[meta] GC memory efficiency tracking bug	[MemShrink:meta]	meta	P2	NEW
1008341	[meta] GC tracking bug for stability issues		meta	P2	NEW
1008846	[meta] Improving Tracelogging		meta	--	NEW
1028242	[meta] Improve octane score on windows		meta	--	NEW
1054841	[meta] Shared memory for web workers	[games:p1]	dev-doc-complete, meta	P3	NEW
1057530	[meta] Reduce our GC max-pause	[platform-rel-Games]	meta	P3	NEW
1103158	[Meta] Remove all non-standard JavaScript features		dev-doc-needed, meta, site-compat	--	NEW
1116674	[Meta] Evaluate OpenCV performance with asm.js (compiled by Emscripten)		meta	--	REOPENED
1122579	[meta] Implement compacting GC		meta	--	NEW
1130211	[meta] Simplify GC trigger mechanisms		meta	--	NEW
1139700	[meta] ES6 internal methods		meta	--	NEW
1147983	[meta] GC microbenchmark for detecting regressions/improvements		meta	--	NEW
1150618	[meta] Spidermonkey shell builds		meta	--	NEW
1152893	[meta] Investigate remaining performance regressions in promises due to async stacks		meta, perf, regression	--	NEW
1154987	[Meta] Move JS parsing off of main thread and enable incremental parsing	[qf:p3][games:p3][platform-rel-Games]	meta, perf	--	NEW
1164973	[meta] Enhance GC telemetry reporting		meta	--	NEW
1172676	[meta] Hazard analysis improvements		meta	--	NEW
1187093	[meta] ARM64: Pass Ion Jit-Tests	[arm64:m2]	meta	P3	NEW
1189360	[meta] Add Code Coverage for JavaScript code.		meta	--	NEW
1192301	[meta] Bring Order to Chaos (in the GC)		meta	--	NEW
1229043	[meta] BacktrackingAllocator: Optimize memory accesses.		meta, perf	P5	NEW
1232802	[meta] Concurrent GC		meta	--	NEW
1245974	[meta] Proxy/Wrapper performance		meta	--	NEW
1259927	[meta] CacheIR tracking bug	[qf:meta]	meta, perf	P3	NEW
1274354	[meta] Date.parse, amirite	[webcompat]	DevAdvocacy, meta	P3	NEW
1280654	[meta] Expose a set of CLDR data via custom APIs for date/time format UI	[gecko-l20n][milestone5]	meta	P3	NEW
1282939	[meta] Improve in-repo react benchmark performance	[platform-rel-Frameworks][platform-rel-Facebook][platform-rel-ReactJS]	meta	P3	NEW
1284975	[meta] Make SpiderMonkey clean on UBSan		meta	P2	NEW
1299643	[meta] Google Docs performance issues due to javascript execution	[qf:meta][platform-rel-Google][platform-rel-GoogleSuite][platform-rel-GoogleDocs]	meta, perf	P2	NEW
1307062	[meta] JS performance (P1-P3 bugs)		meta, perf, triage-deferred	P3	NEW
1307395	[meta] Optimize ECMAScript 6 performance		meta	P3	NEW
1308157	[meta] Wasm optimizations to explore		meta	P3	NEW
1316801	[meta] Wasm baseline compiler cleanup & optimizations		meta	P3	NEW
1317626	[meta] SharedArrayBuffer + Atomics performance work		meta	P3	NEW
1339557	[Meta] Quantum Release Criteria: Figure out why we are so slow on Speedometer v2	[qf:meta]	meta, perf	P2	NEW
1340235	[meta] Virtual function calls are 2.15x slower in wasm compared to asm.js		meta	P2	NEW
1342037	[meta] Optimize Promise implementation		meta	P3	NEW
1343588	[Meta] Make Facebook benchmark fast	[qf:meta][platform-rel-Facebook]	meta, perf, triage-deferred	P3	NEW
1345706	[meta] Improve lazy parsing	[qf:meta]	meta, perf	P3	NEW
1347720	[meta] Improve Time to Interactive (TTI) and Display Done (DD) milestone times in FB feed workload	[qf-meta]	meta, perf	P3	NEW
1347824	[Meta] Make JS Parsing faster	[qf:meta]	meta, perf	P3	NEW
1352486	Improve performance on EmberPerf benchmark	[platform-rel-Frameworks][platform-rel-EmberJS][qf:meta]	meta, perf	P3	NEW
1352524	[meta] Improve GC scheduling	[qf:p3]	meta, perf	P3	NEW
1353816	[meta] Reduce content process memory overhead from system .jsms	[e10s-multi:+]	meta	P1	NEW
1365361	[meta] Baseline: Optimize intrinsics used in self-hosted functions	[qf:meta]	meta, perf	P3	NEW
1367103	[meta] Fix TSAN issues in the GC		meta, triage-deferred	P3	NEW
1371162	[meta] Clean up GC tunables.	[qf-]	meta	P3	NEW
1376904	[meta] Stop doing full GCs		meta	P2	NEW
1380129	[meta] Support AArch64 in ion		meta	P2	NEW
1400237	[meta] GC crashes		meta	P2	NEW
1402534	Bugs found with stackTest (stack exhaustion / out of stack memory) [meta]		meta, sec-want	P5	NEW
1403311	[meta] Results from JS fuzzing coverage analysis	[meta]	meta, sec-want	P5	NEW
1422930	[meta] Prepare a SpiderMonkey ESR68 standalone version		leave-open, meta	P3	NEW
1430049	[Meta] Spectre JIT mitigations		meta	P3	NEW
1430051	[Meta] Spectre bounds check mitigations		meta	P3	NEW
1431826	[Meta] Spectre mitigations for C++		meta	P1	NEW
1431829	[Meta] Spectre mitigations for C++ reachable from JS		meta	P3	NEW
1432207	[Meta] Spectre mitigations for Value type checks		meta	P3	NEW
1435795	[meta] ECMAScript stage 4 proposals		meta	P3	NEW
1435811	[meta] ECMAScript stage 3 proposals		meta	P3	NEW
1435830	[meta] ECMAScript stage 2 proposals		meta	P3	NEW
1435997	[meta] Turn the helper threads system into a real scheduler		meta	P3	NEW
1437103	[Meta] Spectre mitigations for object type checks		meta	P3	NEW
1443170	[meta] ARM64 architecture version support		meta	P3	NEW
1445162	[meta] Improve ARM64 Simulator	[arm64:m4]	meta	P3	NEW
1446898	[meta] ARM64 JS baseline failures	[geckoview:fxr:p2]	meta	P3	NEW
1449600	[meta] Investigate reducing minimum GC memory	[overhead:2MB]	meta	P3	NEW
1454585	[Meta] Improve IonBuilder perf		meta	P2	NEW
1470909	[meta] Remove all use of C-style varargs from SpiderMonkey (except in SpiderMonkey developer C++ debugging functions, e.g. for dumping stuff to stderr)		meta	P3	NEW
1471438	[meta] Provide more performance info to the gecko profiler		meta	P2	NEW
1472062	[meta] OOM while evicting the nursery	[MemShrink:P2][tbird crash][qa-not-actionable]	crash, meta, top50, topcrash	P3	NEW
1478034	[meta] Add an interface to bytecode		meta	P3	NEW
1481434	[meta] Wasm tests in WPT		meta	P3	NEW
1488322	[meta] Heap profiling		meta	P5	NEW
1490847	[meta] Long-standing Ion Compilation Time Issues	[qf:p2]	meta	P2	NEW
1500922	[meta] JSVM - Measure JS Engine behaviour related to page load		meta	P1	NEW
1501438	[meta] Use XPCOM thread pools for Spidermonkey		meta	P2	NEW
1503319	[meta] Streams		meta	P2	NEW
1507440	[meta] Incrementalise more of the GC to reduce budget overruns		meta	P3	NEW
1507445	[meta] Improve generational GC		meta	P3	NEW
1507448	[meta] Parallelise more parts of the GC		meta	P3	NEW
1509069	[meta] Improve SpiderMonkey internal documentation.		meta	P3	NEW
1515056	[meta] Tighten up and improve jsm semantics to enable better performance		meta	--	NEW
1515380	[meta] Shrink GC nursery on background tabs	[overhead:800k]	meta	P2	NEW
1522189	[meta] Separate out string and object pretenuring decisions		meta	P3	NEW
1524305	[meta] JavaScript related bugs found while dogfooding arm64 windows nightlies		meta	P3	NEW
1526993	[meta] ARM64: Post ARM64 Ion Support - Issues/Failures to address		meta	P2	NEW
1526995	[meta] ARM64: Post ARM64 Ion Support - Windows-on-ARM Test Failures		meta	P2	NEW
1529669	[meta] Fuzz bugs specific to ARM64 JavaScript		meta	P3	NEW
1532556	[meta] Optimize boxing of JS values for anyref		meta	P3	NEW
1533449	[meta] Firefox memory use grows unreasonably high in some cases	[MemShrink:meta]	meta	P3	NEW
1537638	[meta] GC OOM behaviour		meta	P3	NEW
1539848	[Meta] Investigate JetStream 2 performance		meta, perf	P1	NEW
1561074	[meta] Implement the WeakRefs proposal		dev-doc-complete, meta	P3	NEW
1564163	[jsdbg2] Debugger implementation cleanup [meta]		meta	P3	NEW
1571996	[meta] Implement WebAssembly tail calls proposal		meta	P3	NEW
1573900	[meta] Parser Performance Measurment		meta	P1	NEW
1587564	[meta] Improve use of BytecodeLocationOffset class in bytecode interface implementation		meta	P3	NEW
1590305	[meta] WebAssembly quality on mobile systems		meta, mobile	P3	NEW
1599723	[meta] Update WebAssembly ABI for multi-value return, tail calls, optimized call_indirect		meta	P3	NEW
1600159	[Meta] Clean Up the FunctionBox initialization Story		meta	P3	NEW
1601332	[meta] Stencil format for JS Parser output		meta	P3	NEW
1609486	[meta] Stencil Performance		meta	P3	NEW
1610542	[meta] Cranelift version bumps		meta	P5	NEW
1611412	[meta] Lots of one-off crashes during testing on MacOS		meta	P3	NEW
1613592	[meta] Replace IonBuilder with a new MIR builder (WarpBuilder)		meta	P1	NEW
1619282	[meta] SmooshMonkey		meta	P3	NEW
1620583	[meta] Improve error reporting code		meta	P3	NEW
1620996	[meta] CacheIR and IC changes for WarpBuilder		meta	P3	NEW
1621641	[meta] Investigate Wasm spec-test failures		meta	P3	NEW	Ryan Hunt [:rhunt]
1621642	[meta] Fix failing 'spec' spec-tests		meta	P3	NEW
1625130	[meta] WebAssembly SIMD		meta	P3	NEW
1628222	[meta] WarpBuilder: CacheIR to MIR compilation		meta	P3	NEW
1632459	[meta] Audit use of Handle::fromMarkedLocation and replace with safer alternatives where possible		meta	P3	NEW
1638111	[meta] WarpBuilder: Transpile important InlinableNatives		meta	P3	NEW
1639895	[meta] MIPS support in SpiderMonkey		meta	P5	NEW
1640284	[meta] Create a tool for easily discovering and diagnosing costly CacheIR stubs		leave-open, meta	P2	NEW	Caroline Cullen [:caroline]
1646039	[Meta] Warp Fuzzing		meta	P2	NEW
1646494	[meta] Integrate JS Stencil work with scheduler		meta	P3	NEW
1648827	[meta] Support AArch64 macOS in JIT and WebAssembly		meta	P3	NEW
1654001	[meta] ECMAScript normative changes		meta	P3	NEW
1655177	[meta] Debugger API Improvements		meta	P5	NEW
1655626	[meta] Implement function-references proposal		meta	P3	NEW	Ryan Hunt [:rhunt]
1662110	[meta] Support progressive compilation of CompilationStencil		meta	P2	ASSIGNED	Nicolas B. Pierron [:nbp]
1662114	[meta] Stencil Backlog Tasks		meta	P3	NEW
1662149	[meta] Use stencil for selfhosted.js		meta	P2	NEW
1662156	[meta] Support instantiating JS stencil without allocating inner-inner JSFunctions		meta	P3	NEW
1663955	[meta] Stencil Phase 2 Capabilities		meta	P2	NEW
1663956	[meta] Stencil Phase 2 Use-Cases		meta	P2	NEW
1670018	[meta] Class static initialization block	[DocArea=JS]	dev-doc-needed, meta	P3	NEW	Matthew Gaudet (he/him) [:mgaudet]
1670403	[meta] Cache Stencils across Documents		meta	P1	NEW	Ted Campbell [:tcampbell]
1677201	[meta] Handle OOM's in WebAssembly better		meta	P3	NEW
1677586	[meta] Implement Memory64 proposal		meta	P3	ASSIGNED	Lars T Hansen [:lth]
1683140	[meta] Memory leaks		meta	P2	NEW
1685127	[meta] Warp: Performance regressions		meta	P2	NEW
1687630	[meta] Instruction selection / codegen improvements for Ion and stubs for wasm on ARM64		meta	P3	NEW
1690460	[meta] SIMD instruction selection optimizations		meta	P3	NEW
1695715	[meta] WebAssembly Exception Handling		meta	P3	NEW
1699266	[meta] Remove internal uses of JSID_* APIs.		meta	P3	NEW
1699271	[meta] Auto generate MIR, LIR, and WarpCacheIRTranspiler boilerplate		leave-open, meta	P3	NEW	Caroline Cullen [:caroline]
1700291	[meta] Pretenure long-lived allocations		meta	P2	NEW	Jon Coppeard (:jonco)
1700381	[meta] Improve Scalar Replacement		meta	P3	NEW
1701164	[meta] Redundant MoveGroups and other Move badness		meta	P3	NEW
1701197	[meta] wasi port		meta	P2	NEW
1706922	[meta] WebAssembly relaxed SIMD		meta	P3	NEW
1707066	[meta] Improve performance on ReactDOM		meta	P1	NEW
1707723	[meta] Investigate CacheIR opportunities in ReactDOM		meta	P3	NEW
1707873	[meta] Move non262/ jstests to jit-tests		meta	P3	NEW
1708400	[meta] Clean-up jsapi header		meta	P5	NEW
1712291	[meta] Optimize i64 arithmetic on x64, arm64		meta	P3	NEW
1712872	[meta] Add ICU4X support to irregexp		meta	P1	NEW	Ashwini Wankhede
1712893	[meta] ARM64 code size improvements		meta	P3	NEW
1714072	[meta] Massive memory use + wasm compilation time with console open		meta	P2	NEW
1715274	[meta] Add support for Type Reflections in the WASM JS-API (js-types)		meta	P3	NEW
1720747	[meta] Implement matrix multiply intrinsic for Firefox Translations		meta	P2	NEW
1727034	[meta] Wasm debugging and tooling		meta	P3	NEW
1728518	[meta] Wasm JIT-bugs		meta	P3	NEW
1729501	[meta] SpiderMonkey Benchmarks		meta	P1	NEW
1729502	[meta] SpiderMonkey Site Issues		meta	P1	NEW
1729503	[meta] SpiderMonkey Intermittents		meta	P1	NEW
1729504	[meta] SpiderMonkey Crashes		meta	P1	NEW
1729505	[meta] SpiderMonkey: Build System & Test Suites & Embedding & Internal APIs		meta	P1	NEW
1729506	[meta] SpiderMonkey Frontend		meta	P1	NEW
1729507	[meta] Assemblers / MacroAssemblers / Trampolines		meta	P1	NEW
1729508	[meta] Garbage Collection		meta	P1	NEW
1729509	[meta] Optimizing Compiler		meta	P1	NEW
1729511	[meta] JavaScript Language		meta	P1	NEW
1729512	[meta] WebAssembly Language		meta	P3	NEW
1729513	[meta] SpiderMonkey Fuzzing & Instrumentation & Security		meta	P1	NEW
1729514	[meta] SpiderMonkey Runtime		meta	P1	NEW
1729515	[meta] SpiderMonkey Defects		meta	P1	NEW
1729516	[meta] Just-In-Time Compilers		meta	P1	NEW
1729518	[meta] SpiderMonkey		meta	P1	NEW
1736059	[meta] Import Assertions proposal	meta	dev-doc-needed, meta	P3	NEW
1736079	[meta] Additional static analyses using the GC rooting hazard analysis framework		meta	P3	NEW
1736620	[meta] SpiderMonkey: GDB Instrumentation		meta	P3	NEW
1740185	[meta] Wasm text annotations		meta	P3	NEW
1740269	[meta] Wasm DOM bugs		meta	P3	NEW
1741457	[meta] Improve SpiderMonkey Error Messages		meta	P5	NEW
1742930	[meta] Optimize call_indirect		meta	P2	NEW

215 Total; 215 Open (100%); 0 Resolved (0%); 0 Verified (0%);