Another feature introduced in Firebug 1.6a11 is support for back and forward navigation. This well known pattern used in all web browsers to navigate among visited web pages turned out to be quite useful for Firebug too.
See how the related UI looks like.
As expected, there are two buttons: Back and Forward, these are used to move within the history of visited Firebug panels. Right click on these buttons opens a pop-up menu with recent history entries.
In this particular case (on the screenshot), the history shows that Cookies, Net and Script panels have been recently visited. So, by pressing back at this moment, the user would be navigated to the previously selected panel - Cookies. It doesn't matter that the panel actually comes from a Firebug extension.
By pressing forward, the user would be navigated into the Script panel (again, using the screenshot example). In this case there are two history entries, since the Script panel was used to display two script files in the past.
Tracking also selected files within a panel (this applies on the Script and CSS panels) is very useful feature. Instead of using the Script Location Menu again and again to pick the target script file (pretty tiring if there is a lots of scripts on the page), the user can just press back or use the history menu to navigate faster to already visited scripts. And yes, the scroll position within the script is also tracked so, you'll end up seeing the same piece of source code as before.
The same feature is now available also in Chromebug (since it's based on Firebug code base) and very useful for navigation among chrome script files.