Firefox on Mac

I have a wordpress website that looks great on all browsers but a friend sent me a screen shot from Firefox on a MAC and there is difference in some spacing.  Is there an emulator that addresses Firefox on Mac specifically?  Are there any hard and fast rules about spacing on Firefox for Mac?
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rgranlundAsked:
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Peter HartCommented:
if it looks "wrong" on a MAC firefox then will probably looks "Wrong" on firefox on a PC  - It may be an old version they are using.
What version firefox did they use?
also have you tried  Safari and Chrome?  (and what versions)
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rgranlundAuthor Commented:
They were using a really old version of Firefox.  Thanks for your help.
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