Why Firefox (ESR version) manual update is failed on selective machines
Launch Firefox, manually check for latest update by going to settings > Help > About Firefox. However the manual update keep showing update failed. Other than Mozilla config file, can we use GPO to configure auto update for Firefox browser?
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If you have trouble with the upgrade, use this link; http://www.mozilla.org/en-US/firefox/all/
Can you go to about:config and set app.update.log to true on one of the failing machines and then use the Javascript console (Ctrl+Shift+J) to see if there is information as to why the update failed?
And yes, you can use GPO to force update, but that error will probably still happen
https://github.com/mozilla/policy-templates/blob/master/README.md#appautoupdate