Just updated t-bird, and once again, it wants to open a completely new browser, other than using the running one.
I started searching, and found something about editing the config, and for the first one of the two they said to change, I find this: network.protocol-handler.app.https;/usr/lib64/thunderbird-3.1/open-browser.sh %s
I don't find this in my TB configs. Maybe it was once set "by hand"?
Simon