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I have Windows XP. In my tools menu, optons tab the box to make Firefox my default browser is missing. How do I get it back? Thank you.

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I can't make Firefox my default browser. I have Windows XP and in the tools menu, options tab that selection is missing

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Tools > Options >> Advanced -> General = at the bottom under System Defaults

BTW, the Firefox 3.5.x versions are supported any longer, you should upgrade to at least 3.6.20 or 6.0.