facebook button on my toolbar disappeared, won't install
The facebook icon has disappeared from my menu. I tried to reinstall it, won't work.
The facebook icon has disappeared from my menu. I tried to reinstall it, won't work.
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This will disable add-on signature enforcement; Enter about:config into your Firefox address bar Click the I'll be careful button Find xpinstall.signatures.required in the list Right click the preference Select Toggle until the value is false https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox
https://wiki.mozilla.org/Firefox/AddOns/Status/Updates#Exec_Summary “Currently targeting Signing with no pref to turn off in Firefox 47”