Yes, it is true that Firefox has a very large repository of extensions. The newly introduced browser Google Chrome has also a growing add-on database and has some good extensions that Firefox misses. If you wish to install a Google Chrome extension inside your Firefox, the add-on Google Chrome extension manager for Firefox will help you. However, the installation is not an easy job and has no support for all extensions. You have to follow as described below after installing the extension (experimental) Google Chrome extension manager on Firefox. If you click on the “tools” menu, “Google Chrome addons” submenu, you’ll see extensions currently installed. (via)
