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Need to keep Firefox from updating from v 21.0

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I just uninstalled v 22.0 because of a problem where it prevented me from copying and pasting. I installed v 21.0 but now Firefox insists on updating itself. How do I prevent this so I can avoid the copy and paste issue? Thanks!

I just uninstalled v 22.0 because of a problem where it prevented me from copying and pasting. I installed v 21.0 but now Firefox insists on updating itself. How do I prevent this so I can avoid the copy and paste issue? Thanks!

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You can find the update settings in the Options dialog, in the Advanced section: Advanced panel - Accessibility, browsing, network, updates, and other advanced settings in Firefox.