On Sun, 29 Nov 2020 16:25:00 +0100 Mourad De Clerck <bugs-deb...@aquazul.com> wrote: > I suspect this is upstream bug #1672139: > > https://bugzilla.mozilla.org/show_bug.cgi?id=1672139
That upstream bug appears to be about addon overlays not being rendered properly: they appear to be enabled, and just not rendering properly. That isn't what this Debian bug is about. This bug report is about Firefox addons installed systemwide (such as via webext-* packages) not being enabled when Firefox starts, and requiring a disable/re-enable to get them enabled. The most easily observed side effect of this is starting Firefox, having the uBlock Origin icon missing entirely, and seeing ads not blocked; after toggling uBlock Origin off and back on, ads go back to being blocked.