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An updated version of Firefox is available to address the issues with Add-ons disabled or fail to install on Firefox. You can download the update for your OS here: https://www.mozilla.org/firefox/new/ For Known Issues and Workarounds, please check out the update at https://support.mozilla.org/kb/add-ons-disabled-or-fail-to-install-firefox

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All Products Support Forum Browse the questions for all the products together in one list.