Web page links in email - Portable TB 1.5 vs. 2.0

I have held off upgrading to Portable TB 2.0 until just recently. Portable TB 1.5 was working fine, so I figured if it was not broke, don't fix it. I am testing out 2.0.0.6 and am troubled by different behavior. I have separate directories, so I can test out both. Here is what I observe.

TB 1.5
When I click on a web page link in an email, it opens my Portable Firefox, switches to the FF application and loads the appropriate page.

TB 2.0
When I click on the same link, it does not open the browser. If the browser is already running, it will load the requested page, but the focus remains on TB. I have to manually switch to Firefox.

Is this a 'working as designed' function of TB 2? Is there a work around to get TB 2.0 to work the way I am used to with TB 1.5.

Thanks,

8-) Ed