User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; sv-SE; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4 Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; sv-SE; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4 After uninstalling a add-on that I've used for a while and then checking about:config I'm finding old preferences for that add-on. This is not just one particular add-on but several. One example of this is the add-on Hyperword. When I uninstalled it I used the Uninstall-button in the extensions window. I think that there should be some sort of check or something for old preferences when uninstalling a add-on. Reproducible: Always Steps to Reproduce: 1. Install a extension 2. Uninstall it 3. Check about:config for preferences from it Actual Results: The preferences are still there Expected Results: The preferences should be gone

I would guess => duplicate of bug 258301