It is IE8 and IE 9 - works great with Google .. to answer your question .. NO .. I have not tried it in FireFox .. also I am testing Norton 360v.5 and it is the same as NIS.. and verifyed by other tester:
D-MASIN-PP, As I said in the above post, it seems Bing is not working well with safe web. I have confirmed this. Apparently a fix is being tested with n360 version 5 and should be rolled out within the next few months to the entire Norton range.