Below we’ve got our top 5 chrome URL’s that can be used in Firefox 3, and all you have to do is copy the URL into the address bar to see what each of them do. Don’t forget to bookmark the ones that you’ll use frequently, and here are some instructions if you want them to open in the sidebar.
Note: The URL’s will obviously only work in Firefox.
1) Bookmarks Management
Used for: Managing bookmarks, tags, and history.
Used for: Managing past and active downloads.
Used for: Enabling, disabling, and uninstalling extensions, themes, and plugins.
4) Saved Passwords
Used for: Managing passwords stored by Firefox.
Used for: Configuring different options in the browser.
Runner Up: Browser inside a Browser
Used for: Displaying a browser inside a browser. This is more for fun than anything else.
[via Firefox Facts]