This happens to me all of the time. I'll be using Firefox to surf the net, open way too many tabs, close a few to open more and realize that I need to go back to a website. Well luckily there are a couple of tricks to help you get your tabs back. 
All you have to do is hit 'Command+Shift+T' for a Mac or 'Shift+Ctrl+T' for a PC and your last tab will appear. If you don't like keyboard shortcuts, just go to history and recently closed tabs and voila- you will see all your recently closed tabs!
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This is helpful, thanks. I hate having to open a new browser window.
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