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How do I go back to an earlier version on Firefox - i.e. not Firefox 4?

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I installed Firefox 4 today and some of its features are not compatible with a site I use for work every day. How do I go back to an earlier version - i.e. 3.6..... - until the site updates their system?

I installed Firefox 4 today and some of its features are not compatible with a site I use for work every day. How do I go back to an earlier version - i.e. 3.6..... - until the site updates their system?

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