Firefox does not launch when a http link is clicked in Thunderbird.

Firefox does not launch when a http link is clicked in Thunderbird.
Running Firefox 3.0.8 with Thunderbird 2.0.0.21 on Suse Linux Enterprise Desktop 11. If I use Evolution as e-mail there is no problem. No error is reported, nothing happens at all. Both firefox and thunderbird are the defaults.
 
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