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Firefox library is blank and just an icon

Joined
Nov 2, 2012
Messages
94 (0.02/day)
My Firefox in x64Win10ProV21H1 would not open the functional window that I expect after clicking on 'Show All Bookmarks'; eventually I used Revo Uninstaller to remove it, and installed Firefox v90. Since that did not fix the problem, I used Revo again to uninstall it, and also deleted all the Firefox entries that RegScanner found in the Registry. Some 10 entries resisted deletion – most related to Avast. Another re-install improved the situation in no way. I even did an Explorer search for all references to Firefox and Mozilla and deleted them before re-installing Firefox. Launching Firefox in Safe Mode (by holding SHIFT down) does no better. Is there a solution to this ?

I seems to have started after I installed Opera browser, but uninstalling Opera did not fix the problem.
 
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