The online version of Angry Birds is specifically designed to work in Google Chrome browser and there is no official release for firefox and Internet explorer.If don’t have google chrome (for any reasons) but still want to enjoy this addicting puzzle game then the wait is finally over for you.The online version has 63 levels.How To Play Angry Birds in Internet Explorer (IE) :
To play Angry birds In Internet Explorer 6,7,8,9 you need to Install Google Chrome Frame Plugin.It will enhance the performance of your Internet explorer to support adtional javascript improvements which run your apps smoothly.It runs in background and is compatible Windows 7 / Vista / XP SP2 or greater.After Installation of Google Chrome Frame click here to play Angry Birds.
How To Play Angry Birds in Firefox :
Firefox doesn’t require any addtional plugin and you can play Angry birds directly by Clicking here.Angry birds is available in SD and HD version.Here are the Direct links
HD Version
SD Version