This is an add-on for Android. You can install this on Windows tablets, but I have not tested it on Windows or other operating systems.
This does not work well, now.
This addon show tabs list, and you can swipe a tab to close. It open Tab-manager page, when click this addon's icon (in address bar). You can bookmark Tab-manager page.
But... Firefox broke the Api about tabs in version 58.
Currently, Firefox does not provide information about suspended tabs to add-ons (including tab order information).
WebExtentions of Firefox for Android 58 can't these.
