RescueTime for Firefox

RescueTime is an extension for Mozilla Firefox. RescueTime sits in the background and measures which site is in focus and for how long. It automatically stops measuring if your mouse and keyboard aren't used for 2 minutes or more. It also allows you to manually stop measuring via a "pause" button. We show you your total Firefox time, what percent of your browsing is "productive", and how your browsing productivity compared to hundreds of thousands of users across the world. You can check out detailed browsing stats to see how much time you spend on individual web sites and apps, which days your most productive on, and more.

Requirements:

Firefox 2.0 - 4.0