This extension removes promoted Accounts, Trends, & Tweets from the Twitter website. It's very simple & doesn't incur any performance costs.
For more robust options, look into AdBlock or Stylish, which can remove ads & customize website styles. But this extension does what it says & won't slow down your browsing experience. See the video for details.
This extension is in no way affiliated with or endorsed by Twitter. Its author does not work for them or have any formal connection to the company.
I've released this project on Github, in case anyone's curious how ridiculously simple it is: https://github.com/phette23/remove-Twitter-promotions
Please submit issues to the issue tracker on Github rather than here: https://github.com/phette23/remove-Twitter-promotions/issues
Ver. 0.2.3 - cosmetic code changes, remove nonfunctional call to chrome.pageAction.show()
Ver. 0.2.2 - change name & description to fit Twitter's trademark policy.
Ver. 0.2.1 - update Chrome's manifest version to 2 before 1 is deprecated, change one word in the description.