Stop Firefox updating in background
If you want to behave like bloody Microsoft, sell out to them so we all know where we stand and can go use a browser we can trust not to go behind our backs making a zillion connections and updates without our consent.
The ability to disable Firefox update checking was removed in Firefox 63. Thanks a bunch. Do not lecture me, Mozilla, about security, privacy and freedom of choice if you're going to enforce automatic updates whether I want them or, for good reason, not. Twats. </Rant>
NOTE: if you do disable automatic updates, it is your responsibility to ensure you apply security updates to Firefox, add-ons and extensions.
Enter "about:config" in the address bar.
Firefox will bring up a Nanny Screen with a warning message that you can mess up your browser and compromise security, with tickbox and continue button. Continue.
In the delightfully confusing BLANK config pane, use the search bar at the top to enter "app.update.auto".
This brings up the one line setting for this item. There is a double headed arrow in a button on the right. Click once, it will toggle the default value True to False. That's it. No 'save' or 'exit' or 'quit' or 'are you sure?' just close the tab and you're done.
If set to "true", automatic updates are enabled. If set to "false", automatic updates are disabled. RC