From organization tools to time management features, here are a bunch of extensions that put the browser to work for you.
Save frequently-entered text for pasting later.
Tomato Clock is a simple browser extension for managing your productivity.
Block distracting websites when you are browsing the web. You can list websites that you don't want to visit in the settings. You can pause or turn off the blocker quickly. Completely open source.
Customizable mouse gesture add-on, which supports over 60 different commands and additional features like rocker and wheel gestures.