Update: As of 2300UTC last night the plugin will no longer work on Twitter.
Tweet up to 280 characters using the new Twitter cramming feature, which otherwise is only available to limited users.
TweetDeck in #280Characters
280-character tweets for everyone [No longer available]
Twitter released 280-character tweeting, but only to a few people during a trial period. This Chrome extension did add the ability for everyone to tweet in 280 characters on TweetDeck.
Update Oct 5: This extension no longer works. Twitter and TweetDeck are now both validating tweet length at the API. ⚰️