it is, but it has something to do with Wildfire having a lower resolution.
yep. it's the resolution thing.
tried doing FOTA to make it 2.2 but didn't fix it.
Angry Birds worked on my wife's Wildfire on 2.1 and on 2.2.
Just start the game and wait a bit. When you hear the title music, most likely, the screen will be black but with music.
Hit the power button of your phone to put it to sleep. Now hit the power button again to wake it up. Then, unlock the phone. The angry birds session will then resume and you can start playing.
Word of warning though... at later levels, the game is so sluggish on the Wildfire that it's almost impossible to play.