As a developer this is one of the more useful addons I use on a daily basis, bravo! Had an idea that might help enhance it's usability for me and hopefully others even further... there are several sites, most notably a web application I'm developing, that I use this with most often... it would be great if I could right click in the frame that I use 99% of the time and set it as the 'default frame' for that site. Then, I can use the normal shortcuts, like CTRL-U for source view, and have the resulting action focus on my selected default frame.
When using the Reload button on Navigation Toolbar, I was losing the current frame on the reloading ny Nagios pages. After installing this plugin, FF magically keeps the current frame on a page reload, too. (FF used to do this all the time - I'm not sure when/why it broke)
This addon is exactly what I needed for refreshing Nagios status pages.
Works for "page info" and "page source", but doesn't solve the bookmark frame issue: If I choose "Bookmark this frame" from the frame context menu, the bookmark opens in the sidebar. If I choose "Bookmark this page" the main page is bookmarked.
I would have expected that this extension fixes this problem.