Hello Olivier, thanks for your reply and yes I can reproduce the bug. Bevore I reinstalled it I removed all Preferences.
Now I ran the Command above and got a Mail with this report A new OAuth token consumer was enabled in Launchpad. If you did not make this change, please open a new Question on Launchpad <https://answers.launchpad.net/launchpad/+addquestion> or visit #launchpad on IRC at irc.libera.chat to alert staff of the issue. I hope this helps to find the Issue -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1931388 Title: Firefox disaplayerror after Update on last version 89 Status in Ubuntu MATE: New Status in firefox package in Ubuntu: Incomplete Bug description: After the last Update from Firefox Browser to Version 89 Firefox is unsuable. The Program starts but the window is somehow transparent and white. I removed and reinstalled Firefox but the problem is the same. My computer is an Amd Mashine running Ubuntu Mate 20.10 Mate 1.24.1 I took a Screenshot. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1931388/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp