See the upstream bug report. They say it's due to a previous bug.
I've sent them the requested files, but no answer yet.
I've even ended up with some extensions in the state "get updated/removed/installed after Firefox has been restarted", but they did not change after restart.
So I removed my "extensions" directory and re-installed the extensions I want (and discovered some new ones :))
See the upstream bug report. They say it's due to a previous bug.
I've sent them the requested files, but no answer yet.
I've even ended up with some extensions in the state "get updated/ removed/ installed after Firefox has been restarted", but they did not change after restart.
So I removed my "extensions" directory and re-installed the extensions I want (and discovered some new ones :))
I don't need the patch now anymore.
Seems like there's been some internal corruption.