Thunderbird email web-links open in current Firefox window

When I click on a web-link in my Thunderbird email, it will open in my current Firefox window (let's say I have Techspot on screen).
Where can I change T'bird (or Firefox) settings, so that it opens in EITHER a new Firefox session (if not open), OR in a new tab (if open).

This only started happening since FF 1.0.4

On the same note, while creating a new thread, or answering a post in 'Advanced Mode', the cursor in the message-window is extremely nervous, probably caused by the 'jumping' smilies. True or false?
This is not the case while answering posts in regular mode.

sounds like a Java issue.

I use Mozilla 1.7.8 with the mail uninstalled and thunderbird installed seperatly. I have no problems at all.

I had the exact same issue with Mozilla a few versions back, but they fixed it.