Google Pacman - Firefox browser extensions may allow it to run without permission

   In Mozilla forums, the root cause to many Firefox issues appears to be an extension, rather the Firefox itself.  Vulnerable extensions allow the game to run without permission.  If a user had their speakers on, game sounds would occur even though they had not started the game.  CoolPreviews and CoolIris were sited as two contributing add-ons, and there may be more. This may help explain why some FF users are not affected.

Google Pacman - Firefox browser extensions may allow it to run without permission
http://forums.mozillazine.org/viewtopic.php?f=38&t=1904009

Below are instructions on how to play game while it's present on Googles home page if desired:

-- Press INSERT COIN (insert 2 coins for 2 player Ms. Pacman version) 
-- Use ARROW Keys to manuever
-- Must blank out all dots to go to next level and avoid attackers
-- Blinking large dots allow PACMAN to temporarily devour attackers