Does not seem to work anymore as of FF 85 . Click a tab and all it does is spin. Shame, seems to be the only tool of its kind at present. Or at least without having to open a developer window.

Note: it did work fine when i first installed it (2019?)

Does exactly what it's supposed to but weirdly breaks facebook messenger's conversation list. It will not show anything in the list unless this plugin is disabled and this is only on Windows and Firefox browser (currently running v67 of the browser)