[AccessD] I love Firefox

Try this:

Open firefox twice.
Load different things in each.
Now click, hold, and drag the tab from one down to the toolbar and over the other copy of firefox. 
Wait for it to select, then drag the tab up to the tab bar of the second copy and drop the tab.  You 
have now copied the tab from the first instance to the second instance.
-- 
John W. Colby
www.ColbyConsulting.com