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Could XUL/JS be used to customize FF for an enhanced view of "related pages"? E.g. the user interface is separated into 2 portrait-sized frames. One XUL frame shows the destination web page. The other shows related information, which could be links, images, thumbnails of other pages, etc. Does something like this exist?

You can do whatever you want from an XUL perspective, but the split-pane behaviour you describe already exists (sidebars). I don't know if there are any extensions that provide a sidebar like that, though, but it's certainly possible.

Good to know. I've only seen the history sidebar that is an outliner tree of links, didn't realize full HTML/JS was available. If a sidebar can respond to pixel-level events in the main window, many interesting augmentation apps are possible.

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