I have tried to get this add-on several times & it is not working for me at all. I go to 'Old Layout for Facebook' and install it - then I go to Facebook & refresh it (F5) & nothing changes. I even have reloaded FB & rebooted my PC (I turn it off every night anyway) & still I get the new layout. Am I doing something wrong? I am on Windows 10 and Mozilla Firefox.
PS: it was working until yesterday.