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update

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I set my firefox to never update version, but firefox keep update it. How to fix it. I don't want to update to another version cause my work need only version 39.0

I set my firefox to never update version, but firefox keep update it. How to fix it. I don't want to update to another version cause my work need only version 39.0

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Type about:preferences#advanced<enter> in the address bar.

Under Advanced, Select Update. Check the settings.

Also turn off Use a background service to install updates