Tech Tip: Re-Open that Web Page You Didn't Mean to Close
I frequently close tabs in Firefox before I'm done with them. Until recently, I would either live with it or go hunting for the URL. However, last week I found a handy "Recently Closed Tabs" feature that lets you view and re-open recently closed tabs. To use, you just go History > Recently Closed Tabs. It's pretty simple, but if you need this to be even more accessible, you can download the Undo Closed Tabs Button add-on so that it's right on your toolbar. - K
i had no idea - this is so cool! thanks for posting.
Or, for even faster work, try Shift-Ctrl-t.
If you can't remember the combination of Shift-Ctrl-t: right-click on whatever tab you still have open, and select "Undo Close Tab."