I have 4 Firefox windows open and in the Windows Task Bar, I see 4 Newest Questions - ... Firefox windows. I have to mouse over them to figure out which one is which.
I'm thinking SO - Newest Quest..., SF - Newest Quest..., SU - Newest Quest..., & MS - Newest Quest...
The favico icons next to each one should tip you off about which is which.
Putting the site first is bad information design, the most relevant thing is the content not the site.
Why not use the tabs feature of Firefox? That way you would be able to see the site icons as well to help differentiate.
