User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 Build ID: 20110902133214 Steps to reproduce: I installed a plugin. Actual results: The browser promoted me for a restart. Expected results: There should not be the need to restart the browser when installing a plugin. The plugin should be dynamically loaded. This is likely to require non-trivial changes, but it's one of the major drawbacks of Firefox.

This already exists since Firefox 4 for extensions that have chosen to support it. https://addons.mozilla.org/en-US/firefox/tag/restartless https://developer.mozilla.org/en/Extensions/Bootstrapped_extensions The support for this in the general case has recently been declared WONTFIX in bug 256509.