ManWalking,

Figured it out !
[snip]

And now I want to know how you got it to work on two laptops, but not on the
third. Maybe because when you said that you did everything the same (on all
three laptops) you actually didn't ?

And by the way, why the heck did you try to run a plugin ment for
Thunderbird (an email client) in FireFox (a webbrowser) ? No wonder it
refused !

Also, from your post I think I may conclude that your rant at that "crappy
Firefox browser" was rather misdirected, as all it did (or *should* have
done) was downloading Thunderbird (which you did not even name in your
initial post) and the FiltaQuilla plugin. After that its involvement was
(should have been) finished.

What a trail of tears I made for myself.

Indeed. But congrats on having solved solved the problem. :-)

Regards,
Rudy Wieser