Hello, A few days ago I reinstalled win10. I backed up my firefox profile to keep all the data I had. After reinstall everything works except youtube. I can log in as usual, I can access my youtube settings, subscriptions etc. but I can not post comments, subscribe/unsubscribe to a channel or get notifications. When I try to subscribe/unsubscribe youtube gives the error "your session has expired, please login" and when I press the login button in the window it forwards me directly to the homepage of the channel I was trying to subscribe. What I have tried: Delete cookies and data: nothing Uninstall firefox completely and delete all the data in user appdata folders and reinstall clean with a new profie: nothing Any ideas? The same youtube account works perfectly on Chrome. I can post, subscribe, and get notifications. This has become very frustrating since I use firefox since 2007 and I do not want to switch to another browser. Thanks in advance.