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SpokenTruth said:
Start Firefox with add-ons disabled. Click the 3 bars in the top right, click the Question icon (help menu), click Restart with Add-Ons Disabled. If you don't experience the same problem, one of your add-ons is the culprit. Then just us a process of elimination to find out which one it is.

Thank you for the attempt to help! But when I go to "help" (actually in my language it's called "open menu") and then click on "Add-ons" it just opens a new but completely empty tab.

Could you give better advice please?