We all know that Firefox has hundreds of great add-ons to enhance our web browsing experience. Since there are already plenty of lists out there that features some of the most essential add-ons, I'm left with sharing to you all this collection of fun Firefox add-ons.

1. Halloween Theme
Since it's almost Halloween, why not decorate your Firefox with this dark-looking theme adorned with customized icons of witches flying across the full moon, Jack-o-lantern, flying bats, haunted house, and a black cat.

2. Pacman
A Pacman-clone for Firefox. You can start playing the game by pressing the up arrow or the down arrow key. Features include:
* stunning retro graphics
* authentic sound effects
* back-in-the-80s feeling
* highscore list

more here