While the recent Firefox news say that the new version has been delayed, you can still use the browser for some unproductive stuff, like playing PacMan.

Pacman Firefox Extension

The Firefox Pacman Extension has one the most retro styles I have ever seen, but at the same time it is just as playable as the original version – it even has a high score list and “authentic sound effects”.

There are 4 different speed settings that work as difficulty levels: slow, normal, fast and insane. I have already installed the extension, so what are you waiting for?

via RedFerret