The note on the commonality of patch authors making changes after getting an r+ at Mozilla is a little misunderstood here. It's very common at Mozilla to grant

The note on the commonality of patch authors making changes after getting an r+ at Mozilla is a little misunderstood here. It's very common at Mozilla to grant "r+ with nits", which is to say "yes land this code, but make these changes first". It's generally not acceptable for patch authors to make arbitrary changes after review, since that should incur another review!