This is a silly problem, every youtubers nightmare I'm sure. I can't like or subscribe on Youtube via Firefox. I'm getting "Your session has expired." whenever I try to do either. I can sucessfully do both on a different browser on the same machine and other machines with this browser do not have this issue. I am running Windows 10. I have tried starting firefox in safe mode, refreshing firefox, deleting all cached content and cookies, renaming the cookies.sqlite file to cookies.sqlite.old and still no results. I've tried disabling every extension that I have and still nothing. I've exhausted my internet search. Is there anything else I might be missing?

Again, I'm logged in to youtube while this happens, clicking on the "sign in" only brings me to the channel page when trying to subscribe and gives me the same message when clicking it again. Also, can't add videos to playlists.