want thunderbird link to open new tab in konqueror

[hacker <golfbuf@gmail.com>]

I'm trying to configure sarge so when I click a link in thunderbird
mail, it opens a new tab in konqueror.

So far, it just opens a new konqueror window.

I used 'dpkg-reconfigure mozilla-thunderbird' to select 'Debian',
which creates /etc/mozilla-thunderbird/auto-config.js, which contains:

//####################################################//
// AUTO generated config file. Don't touch this       //
// use: dpkg-reconfigure mozilla-thunderbird          //
//####################################################//

pref("network.protocol-handler.app.http","x-www-browser");
pref("network.protocol-handler.app.https","x-www-browser");

Also, I have the x-www-browser set to konq, as follows:

root :~# ls -la /etc/alternatives/x-www-browser
lrwxrwxrwx  1 root root 18 Jun 26 20:45
/etc/alternatives/x-www-browser -> /usr/bin/konqueror

Now, in konq, Settings => Configure Konqueror => Web Behavior =>
Tabbed Browsing => I have checked: Open links in new tab... and under
Advanced Options I have checked: Open new tabs in the background, Open
popups in new tab instead of in new window, and Open as tab in
existing Konqueror when URL is called externally.

Unfortunately, when I clicked links in thunderbird mail messages, a
new konqueror window opens each time.

Anyone have success getting my desired set up?

TIA

hacker