Reopen closed tabs in Firefox with your keyboard

We've covered other solutions in the past such as Unclosetab, a Firefox extension that adds a right-click option to reopen a closed tab. Another easy way to reopen a closed tab is simply to visit the Recently Closed Tabs menu under History.
And if you'd like to close the tab currently up, CTRL + W or COMMAND + W should do the trick. Now you have no excuse for your lady to catch you browsing the Apple Store late at night.
So, just how good at time waster games are you? Think you've got the stuff? Well, The World's Hardest Game 2.0 doesn't think you do.
Yes, amazingly, it's possible to have a sequel to a game called "The World's Hardest Game". It doesn't seem logically possible, since if the first one was actually the world's hardest, how could another one come along and share the moniker? It made me doubt the name in the first place. That is, until I tried the game.
The mechanics of the game are very simple. You are a small red square, ...
