Comment # 19 on bug 1174184 from Alexandr Smirnov

(In reply to stefan wannemacher from comment #17)
> (In reply to Stephens from comment #16)
> > Running Leap 15.1 and KDE. My profile was also generated by the main repo
> > Firefox ESR and it has the exact same issue.
> > 
> > I tried messing around by copying the profile and deleting some files.
> > Seemingly tracked it down to the "addonStartup.json.lz4" in the profile
> > folder. When I delete this file, the error doesn't appear again when I
> > launch the profile. Can anyone else replicate this fix?
> 
> I can confirm that it works for me as well.

Confirmed from my side as well.