Look what Curtis just did:
Curtis Bartley is the newest member of the Firefox front end team and, to get his feet wet, he made the world a better place by fixing a very old bug. And its 7 duplicate bugs.
And yes, back and forward keyboard shortcuts work. And yes, both relative and absolute links work. And yes, you can have this in a tab instead of a separate window, either by sticking view-source: on to the front of your URLs (see?), or by finding one of the addons that does it for you.
Way to go Curtis, keep ‘em coming!