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Important: By default, Firefox is set for automatic updates.
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Installing a previous version doesn't fix most problems
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Rather than downgrading, try getting used to the new features or ask a question on the support forum, to see if there is a workaround or a way to restore the old behavior without downgrading Firefox. If you dislike new features in the latest version of Firefox, your first reaction might be to go back to the previous version. Unwanted features in the new Firefox version 3 I still want to downgrade - where can I get the previous version?.2 Installing a previous version doesn't fix most problems.1 Unwanted features in the new Firefox version.
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