Thunderbird won't open http: links in firefox

[Jim Cunning]

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I am having trouble getting thunderbird to open firefox when I click
on http: links in mail messages.

1. I've set the following in prefs.js:
        user_pref("network.protocol-handler.app.https",
"/usr/bin/firefox");
        user_pref("network.protocol-handler.app.http",
"/usr/bin/firefox");
2. I've set firefox as my default browser in Menu->System
Settings->Default Applications
3. I have installed firefox-gnome-support.

When I click on an http: or https:  link, thunderbird displays the
"finger pointing" cursor and outlines the link, but does nothing
else.  When I right click on the link in the message, I get a pop-up
with choices for "Select All", "Convert to->", Copy Link Location",
"Save Link Target", and "Report E-mail Scam".  There is no choice like
"Open with..."

What do I need to add or select in KDE, firefox, or thunderbird to get
this to work?
Thanks,
Jim
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