I have a very similar problem, as do lots of others judging by the number of posts in this forum. I use Flash rarely, so unsure when things went wrong, but I first noticed with Fx 34.0. I tried 34.1 - same. Now on 33.1 - same. Not prepared to try reinstalling any earlier versions as it's so much work (have to uninstall Fx completely, reinstall from backup and set up Fx completely from scratch including all add-ons). What I have found is that if I reinstall Flash, then it works the first time Fx is used. Once Fx has been completely closed down, then Flash will not work in Fx again until Flash is again reinstalled. Obviously this is not a working solution. Android 4.2.2