Hi Meeko,
Thanks for the reply, appreciated.
I read the Adobe Patch Fix article (and various other Adobe-related material) but nothing online appears to offer any resolution to the issue I'm experiencing. Seems there's no quick fix on the horizon and I'm certainly not going thru the unnecessary process of rolling my system back to the previous operating system again and thereafter have to re-install a number of other things.
Chrome ain't an option for me so I'll hang around until someone offers a fix for Firefox.
Thanks again for the reply.