Now, to reduce it further I use mozlz4a.py to decompress and re-compress the file.Ī4 has the following keys:
empty directory with 4 from backup - reproduced.previous + 4 from backup - reproduced (usually, when Firefox 82 is restarted, the themes are back).(also tried with just baseline, same result) baseline2 + removing 4 - themes are back.baseline + remove *.json and extensions/ - no difference (=baseline2 for later).
baseline + removing extensions/*.xpi - no difference.baseline + removing *.json (including extensions.json) - no difference.previous + removing prefs.js - no difference (=baseline for later).previous + removing IndexedDB (storage/) and databases (*.sqlite) - no difference.Using a path name different from the original profile directory - no difference.Starting with old profile, last accessed with Firefox 81.So by removing files from the profile directory, I am able to pinpoint the specific issue further: I pulled my profile from a recent backup and am able to reproduce the issue. The global JS console (Ctrl-Shift-J) contains the following errors related to this bug: 1603810249736 addons.xpi-utils WARN updateMetadata: Add-on is invalid: Error: File resource:///modules/themes/dark/ does not contain a valid manifest(resource://gre/modules/addons/XPIInstall.jsm:669:11) JS Stack trace: Add-on is invalid: Error: File resource://gre/modules/themes/default/ does not contain a valid manifest(resource://gre/modules/addons/XPIInstall.jsm:669:11) JS Stack trace: Add-on is invalid: Error: File resource:///modules/themes/light/ does not contain a valid manifest(resource://gre/modules/addons/XPIInstall.jsm:669:11) JS Stack trace: Add-on is invalid: Error: File resource:///modules/themes/alpenglow/ does not contain a valid manifest(resource://gre/modules/addons/XPIInstall.jsm:669:11) JS Stack trace: followed shortly by 1603810252318 addons.xpi-utils WARN updateMetadata: Add-on is invalid: Error: File resource://gre/modules/themes/default/ does not contain a valid manifest(resource://gre/modules/addons/XPIInstall.jsm:669:11) JS Stack trace: Add-on is invalid: Error: File resource:///modules/themes/dark/ does not contain a valid manifest(resource://gre/modules/addons/XPIInstall.jsm:669:11) JS Stack trace: Add-on is invalid: Error: File resource:///modules/themes/light/ does not contain a valid manifest(resource://gre/modules/addons/XPIInstall.jsm:669:11) JS Stack trace: the STR in comment 3 is able to consistently trigger the console errors, it cannot be used to reproduce the disappeared themes. Open the global browser console and scroll to the top.Start Firefox >= 82 with that profile directory, firefox -no-remote -profile /tmp/profdir81.Create profile directory with Firefox 81, e.g.I'm moving this over to the Add-ons Manager component because the fix is probably to fixup the database in some kind of migration. Mozregression with the STR below (and a custom bisect script) points to bug 1660557 as the likely regressor. But I personally witnessed that the default themes were gone, except for Alpenglow. The console errors are consistent, the disappearance of items in about:addons is not. I encountered this issue after upgrading to Firefox 82 (Firefox from ArchLinux's repository).
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