Great functionality, kinda slow? Rated 4 out of 5 stars
This is a great add-on, and I think we should see it reviewed and taken out of the sandbox. Not just useful for Mozillians, but anyone who rotates their passwords frequently.
One nit, though: there seems to be an inefficient code loop for the reset-by-password dialog. You should probably be chunking the input instead of doing the search after each character, as the UI isn't very responsive.