I have recently created a website for a friend. He has told me when viewed on firefox on mac there are strange black diamonds with question marks in.

I am pretty sure they came from copy & pasting his text from word and that they'll go away when I add the right charset to the header (?) (even tho I can't get vim to display them as anything other than white space in the code), but I would like to test it.

Can anyone point me towards a browser emulator i can run on win7 to recreate firefox on a mac?

Thank you