I failed to find information about Committer agreement in the L10N Quick Start guide. http://www.mozilla.org/hacking/committer/
I wasn't even aware this existed. That whole process (as explained by Axel) has seemed pretty arbitrary, so I'm really glad you found this. I wonder, thought, if it's something that Axel even adheres to. I think it should be, but you never know sometimes. I'll put it into the Initial Setup page where it discusses hg.
"Done" That isn't much helpful. :P It would be good if you can add the link to your fix.