First, open Firefox. Click on the hamburger menu (the three horizontal lines) at the top right, then click “Customize.”
In the “Customize Firefox” tab, you will see a list of interface elements to configure the toolbar.
Click and drag all of the toolbar items except “Flexible Space” into the “Overflow Menu” on the right.
Click on the Unicorn button that appears at the bottom of the window.
A Pong-like game with a small unicorn icon will appear on the left side of the tab. In this version of the game, the “Flexible Space” box serves as a Pong Paddle, and the unicorn icon is the ball.
To play, simply use the arrow keys on your keyboard to position your paddle so the unicorn does not pass it. As Atari Pong’s famous instructions said, “Avoid missing a unicorn for a high score” (or something like that).
If you lose and want to play again, just double click on the Unicorn button.
When you’re done playing, click “Restore Defaults” to quickly remove all items from the “Expand Menu”. Click “Done” to close the “Customize Firefox” tab.
Now you can tell all your friends that you have played Unicorn Pong. If they don’t believe you, just send them the link to this article.