The Proxlet extension lets you take control over your Twitter account.
To be more exact, the Proxlet add-on provides you a contextual menu with options for turning to mute for a while the contacts that write annoying messages and fill up your wall with tweets that you are not interested in.
Here are some key features of "Proxlet":
· Mute noisy users
· Block annoying Foursquare checkins
· Hide tweets based on hashtags
· See just links from chatty users