"It doesn't seem like much of an ifiltration if all it does (by the sound of it) is allow you to open your Firefox bookmarks, etc in the native iPhone browser and provide a search bar that does the same thing. Still nice to have the option to take your bookmarks across to the mobile device, though, and it might help win/retain a little FF mindshare but a far cry from the win that native FF on the iPhone would be"
Are you still asking:
Why exactly would Mozilla be interested in helping a commercial company push their proprietary technology?
Mozilla has a vested interested in supporting proprietary technology (OSX, Windows,Iphone for example) to compete with other browsers. Mozilla wants to get their browser used by the most people to get the most support from web developers.