I frequently work with way too many browser windows open at home, and even more at work. I had a computer programming teacher that made us program without using a mouse for a few weeks, so I kinda had shortcuts beat into my head. I thought I knew every keyboard shortcut around, and have always prided myself on being "The Shortcut King". Lo and behold, I've been missing one all this time! Ctrl+Shift+T will reopen any recently closed tabs in your browser. Accidentally closing tabs is a thing of the past!
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From @destroy