Greasemonkey Rated 4 out of 5 stars

Yes it's true, it doesn't work anymore.
But u guys, u can do this to get it back
Download Greasemonkey - https://addons.mozilla.org/en-US/firefox/addon/748/
After u downloaded Greasemonkey, go to this website and install Power Twitter - http://userscripts.org/scripts/show/55433
Yep, and you got ur Power Twitter back :)

This review is for a previous version of the add-on (1.52).