User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9) Gecko/2008051202 Firefox/3.0 Build Identifier: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9) Gecko/2008051202 Firefox/3.0 Given that we're approaching the 3.0 release of Firefox and it's 2008, It seems very outdated and pointless for a browser to need to completely restart to install extensions. Many other extension- and plugin-bearing programs do not require restarting to use the installed plugin. Reproducible: Always Steps to Reproduce: 1. Install a plugin. Actual Results: The extension manager says "This extension will be enabled when Firefox restarts." Expected Results: The extension is enabled.