Rated 5 out of 5 stars

I came back to the updated FF version thanks to another addon: "LiquidTabs" it's a different kind of animation but if you liked TabEffect give it a try https://addons.mozilla.org/en-US/firefox/addon/71410/

Rated 5 out of 5 stars

OK i decided ! I found the FF 2.0.0.20 Legacy portable on Portable Apps com. and I'm back to the last TabEffect Firefox working version !!