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I actually do not want to update Firefox....other software needs must have Exp. 8....how can I return to version 8 after accidentally saying ok to 9?

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I have software (web connect with another site) that must use version Exp. 8....I accidentally downloaded 9 but need to go back to version 8....how to remove 9??

I have software (web connect with another site) that must use version Exp. 8....I accidentally downloaded 9 but need to go back to version 8....how to remove 9??

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Download old versions from Mozilla FTP ftp://ftp.mozilla.org/pub/firefox/releases/ and disable auto-updates in Firefox options.