I use this several times per day when I close the wrong tab (or window). :)
Firefox
/c/firefox
A place to discuss the news and latest developments on the open-source browser Firefox.
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Even works with 200 tabs open.
Take a better solution from a tab hoarder and research maniac. Use a combination of these addons on Firefox – OneTab, Save All Tab URLs and Open Multiple Tabs. I just save all my tabs regularly as text files and stop worrying about reliance on this feature that can put you in a dicey spot if the browser repeatedly crashes upon loading tabs and windows.
Try T
You're welcome