Sometimes we accidentally close a tab in Firefox we didn’t mean to close. Instead of looking the website we want in the History, you can do this trick to reopen the last closed tab.
If you accidentally close a tab, you just need to press “Ctrl + Shift + T“. And the last closed tab will be reopened in your Firefox.
Try it. Open a new tab, close the tab and press “Ctrl + Shift + T”. Very helpful huh? :d
Edit: You also can open last closed tab from History > Recently Closed Tabs. Thanks to Izzat for this tip. 😉