Yammer is a service designed to help co-workers keep each other up-to-date on their work progress by answering the question “What are you working on?”

Yammer Time is a Firefox extension that reminds you to use Yammer. By default, every 4 hours between 9AM and 5PM on weekdays, it will pop up this obtrusive prompt:

Just tell it what you’re working on (you are working, aren’t you?), and it will go away for the next 4 hours. You can change how often it asks (and on what days) in the Preferences dialog. You can also manually update Yammer by clicking on the Yammer Time toolbar button.

You can install Yammer Time from Mozilla Add-ons.