Firefox suddenly desynced and cant login to fix it.

After restarting my PC, out of the blue Firefox had signed me out, removed my bookmarks and history, etc. Luckily i have all this backed up onto my account and can see all the bookmarks and the like through Android Firefox, however whenever i sign in on my desktop to resync everything up it doesnt work and keeps requesting i sign in, which upon clicking just takes me to my signed in account. Ive restarted Firefox, Restarted my PC, cleared cache and cookies and even reinstalled firefox but the issue seems to persist.