don't know but, i got FORCE FED FF12 last friday then 13 on saturday from 3.6 without asking it to... and i do not like some of the changes they made what rev of FF are you using, maybe the Adobe upgrade isn't all that comparable with the FF release you are running
This problem is 100% cause by the latest upgrade to the Flash player. Uninstall it and try to find an older version and you will be fixed.