I sent Ben a patch, but not having heard anything back, I figured I might as well share the results here too, as it's all MIT licensed goodness (as is my patched version, of course). You can either download an installable xpi build, or fork my repository from github.
My edits are all on a branch named after my github user -- a practice I can recommend, when mirroring some svn upstream repository (with git-svn, for instance); it simplifies the process of tracking vendor updates to a mere
git svn rebaseon master (for you -- git-svn, sadly, is not able to push its metadata about the non-git upstream to github) and lets other people reuse your pristine vendor branch for their own purposes.
Enjoy your easier-to-handle JSON! I guess next step would be to integrate these improvements into the Chrome fork Jamie Wilkinson is maintaining. Any takers?