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Today’s meeting leader is: mconley

General Topics / Roundtable

  • [jaws] Call for experimental features for about:preferences#experimental

Friends of the Firefox team


Resolved bugs (excluding employees)

Fixed more than one bug

  • ariasuni
  • Farooq AR
  • Itiel
  • kenrick95
  • Kriyszig
  • Kyle Knaggs
  • manas
  • Mark Smith [:mcs]
  • petcuandrei
  • Richard Sherman :rich :richorrichard
  • Sebastian Zartner [:sebo]
  • Sonia
  • Stepan Stava [:stepan]

New contributors (🌟 = first patch)

Project Updates


Add-ons / Web Extensions

WebExtensions Framework

WebExtension APIs

  • Fixed regressions:
    • Mak fixed a regression in the downloads API that would make valid downloads to fail (Bug 1637973, originally regressed by Bug 1598216)
    • Rob fixed a regression related to webRequest API listeners ability to modify CSP headers on the requests intercepted (Bug 1635781, regressed by Bug 1462989)
  • Contributions:
    • Starting from Firefox 79, a new browser.tabs.warmup API method is available to the WebExtensions (Bug 1402256). The WebExtensions will be able to use this method to improve user perceived performance on switching between tabs). Thanks to ariasuni for contributing this enhancement!
    • In Firefox 79, browser.tabs.duplicate API method does now ensure that duplicated tabs are created as active, as in Chrome (Bug 1376088). Thanks ariasuni
    • dpk contributed a patch to improve error messages when invalid patterns are used in browser.tabs.query (Bug 1637431)
    • Sonia Singla contributed a patch to not show the WebExtensions contextMenu related to bookmarks on entries without a bookmarkGuid (Bug 1638360)
    • Myeongjun Go contributed a patch to allow localhost’s http urls as search providers defined in a WebExtensions manifest
    • Harsh contributed a patch to allow extensions to observe and modify requests created using the API (Bug 1579911)

Addon Manager & about:addons

  • Removed built-in certificate requirement for addon updates and installs when signed extensions are required (Bug 1308251)
  • other issues and/or regressions fixed in AOM and about:addons:
    • error logged when non-extension add-ons or the browser are being updated (Bug 1643854, regressed by Bug 1618500)
    • addon install cancellation ignored when the addon has been already downloaded (Bug 1559683)
    • addon details page not loaded as expected when clicking the add-on title in the about:addons list view (Bug 1645286)
    • missing select dropdown in extensions options_ui page when embedded into a about:addons page (Bug 1647727)


Firefox Accounts

Sync and Storage


Developer Tools

  • Remote Debugging Added forward, back, and refresh buttons to remote debugging experience (bug)


Screenshot online

  • Console Panel - 4XX and 5XX requests are now displayed as error in the console, and don’t need the Request/XHR filter to be enabled (bug)

479x196px Screenshot online

  • Network Panel - The Messages side panel has been merged into the Response side panel (bug). So, WebSocket frames are now displayed in the Response panel (which would be empty in such case anyway).


Screenshot online

  • Accessibility - Several improvements for a11y contributed by MarcoZ. More parts of the DevTools UI is now accessible to screen readers (bug, bug, bug, bug)
  • Console Panel - Blocked requests have a distinct style in the console (bug)


Screenshot online

  • Debugger Panel - Debugger shows also sources cleaned up by GC (bug)
  • Network Panel - slow requests are marked with a turtle icon. Slow = Waiting for the response from the server is > 500 ms (bug). Default value stored in devtools.netmonitor.audits.slow


Screenshot online

  • Network Panel - support for Server Side Events (SSE) coming in 80. Visualization for text/event-stream content types (bug, test page). Hidden behind a pref: devtools.netmonitor.features.sse


Screenshot online


Form Autofill

Installer & Updater


  • No updates this week

New Tab Page


Password Manager

(”Export Logins…” menu item in the menu of about:logins)

PDFs & Printing



Performance Tools



  • No major updates, but Product is putting together a case to prioritize improvements and new features for Picture-in-Picture.


Remote Protocol (Chrome DevTools Protocol subset)

  • When navigating to web pages with iframes included, all relevant page navigation events are sent out for each and every frame now. To get this finished various other small fixes were necessary too. The formerly added preference remote.frames.enabled is no longer necessary because frame handling is enabled by default now.
  • For the next while, the team will be focused on making Marionette Fission compatible. In the meantime, we’ll be gathering feedback from Puppeteer users and anyone else experimenting with Remote Protocol before we resume our work in that area.

Search and Navigation


  • Some reliability fixes for modern configuration.
  • Post-modern cleanup is now underway and is currently reworking how the search engine cache and initialization routines are handled.
  • Region detection
    • We're now experimenting with doing regular checks for your region and updating it if you've changed location for more than a couple of weeks (before Region used to be static all the time, unless we explicitly reset it) - Bug 1627555
    • Better support to customize params depending on the region - Bug 1634580
    • Experiment will run in Beta to check reliability

Address Bar:

  • Address bar expansion on focus now obeys prefers-reduced-motion - Bug 1629303
  • On Windows it’s now possible to close the results panel by clicking on the toolbox draggable space - Bug 1628948
  • Fixed a regression where search suggestions were not provided anymore when restricting to search (with “?” or an alias) - Bug 1648385
  • Search suggestions will now be shown for a broader range of search strings (But not when the typed string looks like a url) - Bug 1628079
  • Search history is enabled by default in Firefox 78 and obeys the same preference as normal search suggestions - Bug 1643475
  • Fixed a bug where certain domains (like “pserver”) may be transformed into others when typed and confirmed without a protocol - Bug 1646928
  • A new browser.urlbar.dnsResolveSingleWordsAfterSearch preference allows to disable post-facto DNS resolution of single word searches that may be valid intranet names - Bug 1642943
  • Restriction tokens at the end of the search string are considered only if they are preceded by a space (Searching for “c++” now works correctly) - Bug 1636961
  • Tail search suggestions are enabled in EARLY_BETA_OR_EARLIER; release enabling is pending a Firefox 78 experiment - Bug 1645059 (demo: search for “hobbit holes for sale in i”)

User Journey


This week I learned