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How to stop mozilla maintenance from installing itself

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We have an add in that will not run on any version of firefox above 51.0.1 ... so I have unchecked automatic updates unistalled firefox and then installed version 51.0.1 and did not install the mozilla maintenance kit but when they log into another user on the same pc and open mozilla it updates and reinstall's the maintenance kit.... is there a way to stop mozilla from updating completely as I have had to uninstall and re-install mozilla several times now in the past couple of months.

We have an add in that will not run on any version of firefox above 51.0.1 ... so I have unchecked automatic updates unistalled firefox and then installed version 51.0.1 and did not install the mozilla maintenance kit but when they log into another user on the same pc and open mozilla it updates and reinstall's the maintenance kit.... is there a way to stop mozilla from updating completely as I have had to uninstall and re-install mozilla several times now in the past couple of months.

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There is but you will have to take the risk of security holes in older Browser when going on the internet. Others here can give you links but aren't responsibility if something happens should you use a older Browser.

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I understand that but we are only using mozilla firefox to perform one task which is on our local network.. What is the option to completely disable updates.

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First, Type about:preferences#advanced<enter> in the address bar. Under Advanced, Select Update.

[v56+] Type about:preferences#general<enter> in the address bar. Select Update.

Select Never Check For Updates.

Also turn off Use a background service to install updates


Install Older Version Of Firefox {web link} Be sure to read everything here.

If you still want to downgrade, look under; I still want to downgrade. Click the Directory of other versions and languages link. Look for the directory of the version that you want. But, remember that old versions may have security issues.

You should also check out Firefox; Extended Support Release {web link} ESR Notes System Requirements