There's an addon called "Tab Stats" which can be helpful here. No REPL, but hierarchical lists of tabs organized by domain, with the option to close en masse.

There's an addon called "Tab Stats" which can be helpful here. No REPL, but hierarchical lists of tabs organized by domain, with the option to close en masse. Also shows duplicates. https://addons.mozilla.org/en-US/firefox/addon/tab-stats/ https://addons.mozilla.org/en-US/firefox/addon/tab-stats/