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Only those stuck on XP and don't have Windows 7 like Firefox.
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What a patently rubbish sweeping statement, how do you account for those win7 users that use firefox or chrome or opera. Your choice of browser is totally unrelated to the OS you are using as it is the browser, its functions, flexibility, extensions, security, etc. that suit your use of the browser and internet that determine which browser you like best.
My preference of Firefox v IE has nothing to do with the OS being used as that preference was made many years before Vista or win7 every came out.
By your own off the wall statement, you should be using firefox on your XP system
Even on XP you don't have to use IE for windows updates, you just use the inbuilt windows update, either Auto or Notify, etc.