The release of Firefox 33 snuck past my radar on October 13. In my conversations with Mozilla workers, it was explained to me that only major releases would be announced. But there was no announcement for Firefox 33. Clearly I need to keep bugging them about this. At least the release notes have improved.
The version number would seem to indicate that there are a lot of changes in this new version, and the release notes do list several new features. But none of those features are likely to be of much interest to regular users, aside from some improvements to searching.