Rated 5 out of 5 stars

The best extension for dealing with Flash content on a page. However, with FF22, it quit shutting off the Flash elements instantly. Now you have to recycle the page. At least on my system.

This review is for a previous version of the add-on ( 

It's not just you, I also noticed this behaviour.
However I think this is rather useful: If I have to enable Flash on a site I can immediately disable it again, so when I open new tabs, they open without flash, but I can still return to the flash-tab and use its applets.