User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.3a5pre) Gecko/20100523 Minefield/3.7a5pre Build Identifier: This is related to the new addon manager. In versions <= FF 3.6 when a user installed an addon, the addon window would popup and provide a restart button. Reproducible: Always Steps to Reproduce: 1. Install an addon that requires a restart Actual Results: Nothing happens after to you press install. Expected Results: The user should be provided with an restart button when they just installed an addon that requires a restart, both so that they have the option to restart, and so that they are informed that the addon that they just installed requires a restart before it will work. This is related to bug 567616 I think one option would be to have a banner should appear on the top of the tab where an action occurs, be the action an install/uninstall/disable/enable, saying something along the lines of "an addon requires a restart" and which provides a restart button and a hide/ignore/go away button.

Atm, after you install an addon with the nightly that needs a restart, you have to infer that it requires a restart, the go to Tools->Add-ons then hunt for a restart button.

This is part of the work on bug 553455.