Hi ZipWilly,
This is a common misunderstanding for new Firefox users. You need to allow Firefox to install extensions from
passwordmaker.org. By default, Firefox doesn't allow any extensions to be installed--this is a security measure. You must explicitly permit extensions to be installed from a given URL.
So when you click on the link to install PasswordMaker, there should be an image below the toolbar which looks like this:
To the right of the image is a button,
Edit Options. Click this button and allow extensions to be installed from passwordmaker.org. Click the download/install link again, and this time it should work.
Let me know how it goes,
Eric