Thanks!!
If anyone else is doing this, uncheck the auto updates BEFORE you download the version 33!!! I didn’t do that and 34 was installed again over version 33. I unchecked the box and re-installed version 33.
Thanks for your help. I really dislike all of these updates!!
The updates do have a purpose. They plug security holes. When Firefox 35 comes out I will install it if it is compatible with FlashBlock
Just saying but why not try a Firefox update in a few months and see if it works with your Windows 8.1. You can always go back to FireFox 33