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How can I uninstall the last update I installed?

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When updating Mozilla, an application we use through Mozilla became unable to run. We need to go back to the previous version we had been using.

When updating Mozilla, an application we use through Mozilla became unable to run. We need to go back to the previous version we had been using.

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Uninstall firefox, Then download the version which you want to install.

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Firefox 36 is a beta pre-release version.

You can get the latest release version here. https://www.mozilla.com/en-US/firefox/all.html That URL always has the most recent Release version, and is the full-installer package. So you may want to bookmark that page for future reference.