From Securelogy Consulting:
Keep track of all available Firefox extensions, mass install, and uninstall multiple extensions from the huge Firefox extensions database at Mozilla. Disable and, enable extensions and easily maintain the same set of installed extensions on multiple. The Firefox Mass Extensions Manager is a major addon to the Firefox extensions manager and not a replacement. What it does is it enables the user to have full control of the extensions management within Firefox. The Firefox Mass Extensions Manager keeps track of the development at Mozilla and maintains a database of all extensions and description. To get a list of the latest extensions you only have to update the extension list once a week or as you wish. This process takes few seconds. After the extension list is updated you are free to manage you extensions with the Firefox Mass Extensions Manager. This version is the first release on CNET Download.com.