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Actions from last meeting

  • None

General Topics / Roundtable

(tips/tricks/FYI, productivity improvements, industry news)

  • Switched to eslint 2 so you may need to run: mach eslint --setup
  • Intent to unship: add-on compatibility check in application update
  • Late notice from last meeting: if you need to set prefs from the content process, you can use AsyncPrefs.jsm:
    • -
    • Uses a list of "allowed" prefs to avoid content process sandbox escapes, to which you'll likely need to add your pref.
  • Collapse diffs in MozReview

Friends of the Firefox team

(Give a shoutout/thanks to people for helping fix and test bugs. Introductions)

  • Johann Hofmann
  • Tim Chien - [:timdream] - Visiting from Taipei
  • Katie Broida
  • Resolved bugs (excluding employees):
    • More than one bug fixed:
      • Rakhi(:rakhisharma)

Project Updates


  • says "Yes, I think we are". So that's good.


  • Thank you so so so so so so much for working on tests. The whole e10s team is indebted to you all.
  • Making good progress on performance issues. tpaint regression is mostly under threshold now. Still room and ideas for improvement there. tps is where effort is being shifted to now.
  • A team of folks under jimm and kanru are working on improving stability. We're waiting on beta experiment data to determine if it's having the desired effect.

Go Faster


  • e10s: Now enabled on nightly & aurora. One main issue left that Hello team is fixing (bug 1257243), one Firefox issue (bug 1257790)
  • e10s: Would like some help with bug 1262560 Investigate turning on em:multiprocessCompatible for Hello
    • When we turn this on, various mochitest test runs start leaking. Removing all of the add-on core code doesn't resolve the issue.
  • We're thinking about error catching/reporting in tests and at runtime
  • Another substantial round of product changes in progress


  • desktop Firefox no longer uses an about:certerror page. about:neterror will now be displayed in those cases where about:certerror would have been used in the past (the style differences have been carried over)

Quality of Experience

  • E10S test fixes!
  • QX/onboarding work...
    • bug 1219810 - improve bookmarking
    • bug 1017919 - preserve addons after a profile refresh
    • bug 1160424 - UI notification for missing system codecs (EME/Widevine CDM)
    • bug 1151449 - curly quotes!
      • actually bug 1259859 is where the big batch of changes and new test were added


  • New awesomebar results UI in Nightly.
  • Putting together a telemetry experiment report from unified-search to discuss in the team meeting tomorrow.