Rated 5 out of 5 stars

Thank you for the latest update. Saved Password Editor now looks much nicer :)
I think you can remove "Close" button from the bottom of the window. This button available in the caption of this window.

This review is for a previous version of the add-on (2.7). 

Thanks.

If by the "Close" button. you mean in the Saved Passwords window, please understand that I didn't write that window. It's part of the Mozilla Toolkit that is available to every application that uses that toolkit. I don't want to modify it much more than necessary. Besides, if I were to remove that button, there might be unforeseen consequences for someone who relies on its presence (I'm thinking along the lines of accessibility or something).