@Basic:
Thanks for testing.
The "icon not updating it's status on tab change"-bug is already on my list. It can also happen if you forward/rewind in the history of a tab.
The problem is that the extension adds a listener to the "load" event of a page and that event is not happening on tab change. I will fix it as soon as I can (writing tests at university at the moment

).
It is the same for status bar and menu bar icon. For now, just reloading the page helps.
Yes, the icon set is not the best one, especially that on the status bar. It's just a 16x16 px PNG-Icon, named "icon-small.png" and "icon-small-disabled.png". If you like, you may propose another one.
Comments are welcome!
@couldabeen:
My extension uses Firefox built-in password manager (Tools>Options>Security>Password, Remember passwords). The difference is that it doesn't fill in the login form automatically, which can be a security hole, as mentioned in my first post.
Instead it outlines the login fields for which valid logins are stored in the password manager and allows you to login with one click on a status bar or toolbar icon.
I had two purposes for this extension: Implementing the comfort of Opera's Wand and making auto-logins a bit more secure (not prefilling form fields).
My extension so far respects if pages like that of online banking sites don't allow storing of passwords (which is controlled by the non-standard html tag autocomplete="off"). That is, because the storing of passwords is not handled by my extension but by the built-in password manager.
If you want to be able to always store the passwords, there is another extension, as well as a greasemonkey script and a bookmarklet doing just that:
http://roachfiend.com/archives/2005/03/ ... -password/