I cannot find an option to remove add-ons, extensions etc - this is very important and extremely fustrating.. I am trying to install the Topcashback notifier extension which gets to the final stage of asking me to select my language then goes no further (doesn't freeze just does not do anything). Therefore I want to remove all extensions and plugins from Firefox to see if the problem lies there however in trying to do this I noticed Shockwave Flash add-on is installed but not activated (apparently for security reasons). Why is it installed? I did not put it there. I want to remove it permanently -How? Also what is stopping the Topcashback notifier from completing its install? My Firefox version is 56.0.2(64bit) The only extension I installed is Keefox (which works perfectly). I am trying to install the Topcashback Notifier extension. The Topcashback extension shows as installed under extensions but as already mentioned it does not finalise opening a full Firefox page requesting a language to be chosen each time any search link is activated - very annoying. Plugins installed are the default ones that come with Firefox OpenH264 video codec - Cisco Systems inc Widevine Content Decrytion Module provided by Google and the unwanted Shockwave Flash plugin. I installed the Topcashback notifier into Chrome (just to test it) and it worked fine on that browser however I do most of my online purchasing using Firefox so I would be very grateful if you can solve my queries. Thank you.