Opening Add-ons
I can't open Add-Ons from menu bar/tools/Add-Ons or ctrl+shift+A. It opens a blank tab instead. Firefox 80.0.1 (64-bit). I have to restart Firefox with Add-Ons disabled in order for it to work.
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It could be the work of one of your add-ons, or it could be Hardware Acceleration. How to disable Hardware Acceleration {web link}
Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control> (Mac=<Command>) <Shift> A)
In the Add-ons Manager, on the left, select Extensions. Disable a few add-ons, then Restart Firefox.
Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All Of them.
If the problem continues, disable some more (restarting FF). Continue until the problem is gone. After, you know what group is causing the issue. Re-enable the last group ONE AT A TIME (restarting FF) until the problem returns.
Once you think you found the problem, disable that and re-enable all the others, then restart again. Let us know who the suspect is, detective.
Is your Firefox hijacking all your searches over to Yahoo instead of Google? If so, while in Safe Mode, look for an extension named "New Custom Tab" that other users have identified as causing that problem (and the blank Add-ons page).
I diabled IDShield Vault extension and that solved the problem. It also fixed the problem I was having with Googlemaps.com giving me "serror errors".
Thanks for the quick response.