Theory: Due to Google beginning to compete with them, Mozilla has sought alternate revenue streams.  One of these streams is Adobe, who in the face of competition from advanced Javascript support, Canvas elements, and HTML video, has payed the Mozilla foundation to pull the rug out from under the last lynchpin in clearing the web of flash: video.<p>Video codecs may change over time, but once you scrape flash off, it's going to be gone forever.  Theora will <i>never</i> gain support.  By refusing to support h.264 in the near term, Mozilla hamstrings support of HTML5 video and allows Adobe time to regroup their product strategy.