Review for Saved Password Editor by Daniel Beardsmore
Rated 5 out of 5 stars
No idea why it took me so long to think of looking for an add-on to do this! Really useful for sites that, for whatever reason, bypass the automatic password detection (probably nonsense like postback). Now I can continue to have unique passwords for sites and safely forget one or two ;-)
This review is for a previous version of the add-on (2.5.1.1-signed).To create your own collections, you must have a Mozilla Add-ons account.