It would be useful if a list of tab thumbnails were overlaid when switching tabs with Ctrl+Tab in Firefox, like when switching apps in Windows. This feature would be useful in full screen mode and could replace the tab bar.
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Can you elaborate on what you mean?
Firefox already has a floating bar which comes up showing the title, icon, and screenshot/thumbnail of webpages when switching with ctrl+tab.
(Just ensure you have the ctrl+tab option enabled under General of about:preferences )