FWIW, Mozilla seems to share the same sentiments about many of the standards that Google has been pushing for. They may have different incentives, but Apple does not sit alone on every one of their views.
Mozilla doesn't have a multi-billion dollar App Store creating a direct conflict of interest. Their motives aren't comparable. A few overlapping concerns don't refute the primary evidence of Apple's self-serving behavior. The key decisions that hobble web apps and protect the App Store moat are specific to Apple's conflict of interest.