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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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