Rated 5 out of 5 stars
I actually run this alongside Master Password+ and Saved Password Editor. I found that the combo of all of these makes Firefox a nearly complete, robust, and flexible password management system. Easy and just great!
Also, hooray for the GNU GPL as the license. Works like this that respect software freedom deserve our support!
There will be more improvements around logging on (and export/import), I definitely recommend SPE as an alongside install. As regards MasterPassword+ I find it a little too much for my personal purposes; that's why I added the "lock" button on the bottom right which can be used to lock out unauthorized users. Still having a little problems with having the correct icon shown on Firefox startup (there should be a lock displayed unless you enter the MP).
If you would like to discuss your needs more please don't hesitate to contact me via the support pages!