I am pretty sure I'm the only person in the whole world with this problem because I couldn't find this issue in any search engines including Google. I used that online site (I forgot name) to make a new Firefox theme (just fiddled around colours, images etc), but didn't commit and closed Firefox and forgot about it. Now everytime I open Firefox, that same theme takes over whatever theme I have selected or the default theme. I can change to other themes fine but when Firefox restarts, it reverts back to that theme. I don't understand why something I didn't even save is taking control like this. I don't want to delete/reset profile or re-install Firefox. Any help is appreciated. Thanks.