Mozilla has removed the ability to disable updates in Firefox browser from version 63 as they’ve got rid of ‘Never check for updates’ option Under Firefox Updates in General section of preferences and now you’re left with two options: Automatically install updates and Check for updates but let you choose to install them.
The closest you can get to turn off Firefox automatic updates with available options is the second one, but that also checks for updates and nags you to update to latest Firefox version. If you don’t want to turn on the second option and looking to disable updates in Firefox 63 anyway (mind you no about:config preference available), you can, here is how.

Note: For security reasons, you should always be running the latest Firefox version, unless you have a strong reason to say No, the browser should be left to update automatically.
Prevent Firefox from updating in version 63 or later
1. Download and Install Enterprise Policy Generator add-on from AMO
2. Click on its icon on the toolbar
3. In the left pane, after scrolling down under ‘Updates & Data Collection’
4. Select ‘Prevent Firefox from Updating’.

Has that helped you? Do you have a valid reason to disable Firefox updates?
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