Deploy experimental builds using the Firefox update process

Sure, it's probably not hardened against version downgrade attacks, interruption attacks, no-progress attacks, and maybe not even against CA compromises.

But it's gotta be better than nothing, and maybe it is easily serviceable into something that will work for us.

Users are having a hard time manually working with our TBB packages if they want to preserve bookmarks, settings, and history, and are getting themselves into trouble by copying pieces of them over each other incorrectly while trying to manually upgrade: https://lists.torproject.org/pipermail/tor-talk/2011-October/021771.html

I think any form of process that automates this for them is a step above status quo. It's just a matter of finding out if it is significantly less time+effort to deploy than Thandy, and what the security tradeoffs are.