This restartless add-on lets you use Twitter to search for #hashtag and @username from the address bar in Firefox on the desktop and on Android!
Instantly connect: Search people and topics on Twitter using @ and # from the address bar.
Stay informed and updated: The pinned Twitter App tab lights up when new Tweets arrive.
Search Twitter: Switch to Twitter Search by clicking the drop down arrow in the search box.
Announcements:
http://blog.mozilla.com/blog/2011/06/01/official-twitter-add-on-brings-twitter-search-to-the-mozilla-firefox-awesome-bar-on-desktop-and-mobile/
http://blog.twitter.com/2011/06/searchphotos.html
Screencast:
https://mozillalabs.com/prospector/2011/06/01/exploring-social-search-with-twitter-address-bar-search/