You may need to enable or 'unhide' the bookmarks/favorites toolbar in your browser. That said, the plugin has not been heavily tested in other browsers, and thus support in other browsers may be limited. The bookmarklet has been tested in the latest versions of Firefox and Chrome. To install bookmarklet, drag this text link to your browser's bookmarks/favorites toolbar: Convert Video! If you are unfamiliar with bookmarklets, please see the corresponding documentation for the Firefox & Chrome browsers.
A bookmarklet is a tiny program stored inside a browser bookmark, and it's typically executed by clicking a button in the browser's bookmarks/favorites toolbar.