Have installed this plug in 35 times in one day. It shows on the extension tab and is active but iCloud WILL NOT RECOGNIZE THIS PLUG IN so everytime I try to sync my bookmarks back to Firefox on my W7 PC I get routed to install iCloud for Firefox AGAIN. GIVE UP. This doesn't work. Furious at Apple too for not allowing me to get and exported .json file that I could import. THIS SUCKS. I have now lost HUNDREDS OF BOOKMARKS. WAY TO GO!!! If I could rate LOWER than 1 star or give NEGATIVE stars I would. #CompleteAndUtterFailure