R.I.P Firefox. Hello Opera!!! And Mr akiha. Your solution C:\Users\%USERNAME%\AppData\Roaming\Mozilla\Firefox\Profiles\[name].default\extensions Is NOT working for Linux users!
PROBLEM SOLVED! For the time being. https://www.ghacks.net/2015/06/19/how-to-disable-the-firefox-40-add-on-signing-requirement/ https://www.ghacks.net
