Rated 3 out of 5 stars

First, this is a decent login-password manager, but it has one Con to it. Hence the 3 star and not 4 or 5.

Con:
It cannot save login information when the login form is located in a sub-folder or when a website is located in a sub-folder. This means if a person owns several websites all located in sub-folders of his main Domain URL, this password editor won't work.

Example:
www.yourwebsite.com/wordpress/login.php
www.yourwebsite.com/wordpress-2/login.php
www.yourwebsite.com/wordpress-3/login.php

By default FireFox saves per the main domain URL ignoring any sub-folders.

This con makes it impossible to use a password editor or password manager to auto login to websites located in sub-folders. It cannot distinguish between the URL sub-folders.

Not all websites have their own domain names when installed in sub-folders. I have several WordPress installs on my main website for demo purposes and do not want to create new domain names for each install. This is why I needed a password manager that can distinguish between login forms based on URL's that contain sub-folders locations. And for higher security, each install login has different user names and passwords.

Suggestion:
Maybe you can install that feature? - to be able to save login information per the URL and not restrict it to the main domain name.

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Aug 19 / reply to Daniel:
The function of your extension is much the same, albeit some differences with another extension I downloaded and it works great. It provides "Add Secure Login Bookmark" and with that I was able to specify a subfolder for the login page, one for each WordPress subfolder domain site I have on my main domain. So yes it can work and even in FIreFox saved password editor that comes with it by default actually shows the subdomains that belong to each login.

I did not mention that extension here on purpose, but wanted to say, Yes its possible and beside that bookmark feature does pretty much the same as your extension.

Yes, it uses a work around, but whatever works.

This review is for a previous version of the add-on (2.9.6). 

Unfortunately, that is not possible. The built-in Password Manager inflexibly matches sites only up to the domain name (and port number, if that is part of the URL). If you try to feed it any more information, it simply refuses to match it. This is not something Saved Password Editor can control. Sorry.

If this is something you require, you will need an application or add-on that can deal with it, such as a password manager. There's also iMacros for Firefox https://addons.mozilla.org/addon/imacros-for-firefox/ which is a bit overkill but is quite likely to work for this situation.