Several people (myself included) have expressed interest in a "go back" feature for mothra that follows the order of links visited. Attached is my patch implementing this. I've tried to keep it as simple as possible. Clicking links in the alt bar will change the current page in the nav stack, but the stack only gets pushed to when a new link is visited (either via clicking a link on a page, typing a URL manually in the URL bar, or plumbing).