Omnitweety
You don't need to leave your browser or your current tab, just tweet from the Omnibox (a.k.a. URL or Address bar)!
Type 'tw' + [space/tab] in the omnibox, then write your status & hit Enter to tweet!
Omnitweety is open source, you can access code from
Follow
i used "chromnitweet" one before but after Twitter updated the Outh thingy it kept putting you in a loop of login in to authorise the extension
had this one on my list to try so, far, so, good lol
once you login to authorize it in twitter you'll be given a code to then input into the extension settings which should stop it asking for authorisation when log-out from twitter and back in