Ryan McCue has released a cool bookmarklet which when used on the WordPress Plugin Repository, will take you directly to the code browser for that plugin. The bookmarklet works on subpages of the plugin page as well as the installation or FAQ pages. If you’re using FireFox, drag the link for the bookmarklet to your bookmarks toolbar. Then, when on a plugin page within the repository, click the button and you’ll be taken right to the code repository for it.
Plugin Code Repository Bookmarklet