Platform/2013-02-12

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Meeting update

• Lawrence Mandel will take over as meeting chair
• Starting Mar 5 we will use the Engineering Vidyo room
• This is a dev meeting - want to make it more of a working meeting
  • Meeting used to include GFX, JS, Layout, Video, DOM, WebAPI, Network, Identity, Plugins, Mobile, Accessibility, Tree Management, and Security
  • Participation welcome!

Notices/Schedule

• FF19b6 went to build today (have no further planned FF19 changes). Make sure you're focused on tracked FF20 issues!
• FF19 sign-offs are tomorrow (PDF.js is on!)
• FF19 release, ESR17.0.3 release & the associated merge day will all be on 2/19

• You should now be receiving (informative) reminder emails about tracked platform issues, every day, for unlanded approvals and in addition:
  • On Mondays bugs tracked for upcoming releases.
  • On Thursdays tracked bugs that haven't been investigated yet this week

35 bugs (40 bugs last week)	6 bugs (19 bugs last week)
Unresolved Aurora 54 Trackers (non-security, not tracked for Beta)	Unresolved Beta 133 Trackers (non-security)

Key Issues

Actions Last Week

Issues

Products/Projects

Firefox OS

Friday, Friday, Friday!

Firefox Desktop

Performance work

• bug 836912 added probes for session store data collection, bug 828097 added some for tab animation smoothness. Both areas where we have active efforts to improve performance/responsiveness, and so this data will be valuable.

Social UI

• mhammond landed a large refactor of multi-provider UI support. Patches for better provider management UI builds on top of that.

Firefox Mobile

Blog Shout Out

• Smooth Scrolling: http://chrislord.net/index.php/2013/02/11/tips-for-smooth-scrolling-web-pages-edgeconf-follow-up/
• FOSDEM Fx Android: http://chrislord.net/index.php/2013/02/07/firefox-for-android-in-2013/
• Perf Measurement Summary: http://gbrownmozilla.wordpress.com/2013/02/01/firefox-for-android-performance-measures-january-check-up/
• Super interesting: https://staktrace.com/spout/entry.php?id=789

Memory, Responsiveness Usability

Trunk landings

• bug 833777 - UI fails to load intermittently
• bug 674739 - Implement DOM3 KeyboardEvent types for audio

Great progress on

• Fixing for Fx19: bug 839380 – zh-hk locale should use zh-tw translation instead of zh-cn
• Targeting Fx21: bug 716403 - Request to hide the navigation bar when scrolling down content
• Recently +'d: bug 822810 - Unexpected painting behaviour with low-res tiling code
• WIP: bug 477166 - Have an automated way to check for changed interfaces without iid changes
• P1 for games: bug 829747 - Do Async Canvas layers update

Stability Wins

• bug 830557 - java.lang.NullPointerException at com.android.internal.view.IInputMethodManager$Stub$Proxy.startInput(IInputMethodManager.java:359) startup crash during test
• bug 837373 - java.lang.NullPointerException: at org.mozilla.gecko.Favicons.isLargeFavicon(Favicons.java)

Other Cool Stuff

• Landed: bug 832508 - Pausing and resuming fennec on the ouya reopens it with a blank screen
• Landed in trunk, bug 834681 - Add support for basic distribution modifications

Stability Report [Weekly]

• Need input/ideas on bug 837835 - increase in crashes with EMPTY dumps (ESR is even worse: bug 830808)
• bug 798274 is a trunk crash that came back recently from being very intermittent - needs an assignee and some investigation.

Firefox for Android

• What do we do about Flash (unsupported by Adobe, esp. since Android 4.0+)? ( spreadsheet of flash crashes)
  • Though Flash support is a major feature, it's also one of the largest pains we have, esp. in terms of crashing
  • >15% of all crashes in 19.0b5 are Flash-related (probably more, this is only based on the top signatures and obvious indicators for Flash being involved)
  • Because Adobe doesn't care, those are really hard to debug, Flash is a "black box" for us
  • If we continue to support it, can we put Flash in its own process like we do for desktop?
  • Sumo has mentioned that we get more complaints that flash isn't available more so than the reports of crashing.
• Filed bug 840634 – [meta] What should we do about Flash in Fennec?

Snappy [Bi-Weekly]

• Feb 7 Minutes
• Snappy work week Mar 18-22

Startup & Shutdown

• Benoit is working to stop font loading during shutdown (bug 833087)
• Don't use timers on shutdown

Tab Strip

• Avi discovered that tab animation performance suffers from 100% gradient cache misses (bug 837542), which may result in a big memory spike during tab resize or animation - bug mentions 500Mb vs 1Mb if cache is disabled.
  • Jeff opened bug 838758 to improve gradients cache hits by changing cache key
  • More related pattern caching work in bug 835284 and bug 764299
• Windows with Intel GPU - when resizing window eats 5Mb/s (?) while resizing

Content

• Bumping Plugin Hang UI timeout from 5 seconds to 11 seconds
• Honza's working on a rewrite of DOMStorage (bug 600370)

Tools

• Profiler patches are ready to support Java profiling, waiting on breakpad to land them (bug 788022)
• Profiler is being updated with multi-thread support
• Breakpad patches have been landing \o/. Tracked progress via meta bug 779291.
• Demo of Java + MT profiles: http://people.mozilla.com/~bgirard/cleopatra/#report=2c44df22ccb94a5edf0645171ede974b134b0193

Metro [1st Tuesday of each month]

Games [1st Tuesday of Month]

Mobile Web Compat [2nd Tuesday of Month]

• Feb 7 minutes
• John Jensen's research shows that ~49% of the Alexa top 1000 sites have a mobile version

Recent issues and changes

• Firefox for Android tablet UA change (dropped "tablet" token) was reverted. Not clear yet if this will reland (bug 829596)
• Embedded YouTube videos do not play in iFrame (bug 834965) seems to be a regression
  • Do we have unit tests for our UAs?
• Twitter t.co URLs show in browser history - redirect happens in JS (bug 838332)
• Firefox OS contacts app redirects Facebook sign-in from https:// to http:// when importing contacts (bug 837435)

Critsmash [3rd Tuesday of Month]

Memshrink [4th Tuesday of Month]

Engineering Metrics

Roundtable

• as of next week can we record or live stream the meeting - for contributor purpose to benifit them (satdav)
• can everyone please mute when they are not speaking as their is a bit of noise in the back ground (satdav)

Actions

• Jet to give Shumway update next week, see about scheduling regular update for this project