Thanks, Waldi. Works great. The one the other user talked about, Hover
Zoom, was deleted from the Firefox store because it was riddled with
malware and bugs. It was replaced by Hover Zoom+, which is apparently
from a different developer. It's also open source.
If you decide to install them both to test them, don't enable them both at
the same time or you'll get two enlargements, one underneath the other.
It doesn't cause a problem, but you can only see one enlargement and
you won't know which is which. They both seem to work very well, but I
haven't fully tested them, yet.
Good luck. Thanks, again, for the help. Hope this is helpful.
Forgot to include the link.
https://addons.mozilla.org/en-US/firefox/addon/hoverzoom-plus/?src=recommended