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How to uninstall the latest update?

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I updated to the latest version, but I use my school laptop, because of this update I can no longer access my school intranet as it is blocked. An email was sent to the students asking to uninstall the latest version, and use the one that worked before.

I updated to the latest version, but I use my school laptop, because of this update I can no longer access my school intranet as it is blocked. An email was sent to the students asking to uninstall the latest version, and use the one that worked before.

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You can install a portable (ESR) Firefox version to access websites that do not work with the current Firefox release.

The portable version comes with its own profile folder and doesn't interfere with the currently installed release version.