Was looking around for a solution.
Cuckchan had one which was simple and worked:
1] Shut down Firefox
2] Open extensions.json in Notepad++ or something that has a replace words function to make your life easier. Search it in:
(AppData\Roaming\Mozilla\Firefox\Profiles)
3] CTRL+F opens search, go to replace tab and then (include quotes):
Replace all instances of "appDisabled":true to "appDisabled":false
Replace all instances of "signedState":-1 to "signedState":2
Save, make it "read only" in file properties and start browser.
Go to Addon-Page. Don't be confused by addons asking to restart browser, just disable each addon manually and then enable it again. THEN restart browser.
Shit will work now. Fuck Cuckzilla, fuck Muhammad, and most of all FUCK JANNIES.