8aweek is a new Firefox plugin that helps you keep track of thet time you spend on web pages. And if you need a gentle reminder that you just can't handle the freedom, you can tell 8aweek to restrict the amount of time you spend on certain sites.
When you install 8aweek and restart Firefox you should see a new browse toolbar. Click on the View habits and you'll be taken to a web page showing how much time you've spent on every web site while logging was enabled. 8aweek seems to know the difference between a page you're actively looking at and a page that's open in a background tab and will only log pages in the foreground. But it doesn't differentiate sub-sites. For example, Gmail and Google Reader are lumped together as Google.
You can also click on the restricted tab to add pages that you don't want to spend too much time on. Then click the preferences tab to determine how much time is too much. By default, this setting is 30 minutes. There doesn't appear to be a way to set different time limits for different sites.
The browser toolbar also lets you "save" links to pages you want to come back to later.
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