This is slightly different. This add-on (along with the Twitter Firefox build, https://twitter.com/#!/download/firefox/ https://twitter.com/#!/download/firefox

This is slightly different. This add-on (along with the Twitter Firefox build, https://twitter.com/#!/download/firefox/ https://twitter.com/#!/download/firefox/) also lets you search Twitter using @ or # in the address bar. The beta 8 stuff just adds Twitter to the list of default search engines.