Hello, heres how to turn off automatic updating:

From Firefox Menus:

   Select the “Menu” Button button in the upper-right corner, then choose “Options“.
   Select “Advanced“.
   Choose the “Update” tab.
   Select one of the following options as desired:
       Automatically install updates
       Check for updates, but let me choose whether to install them
       Never check for updates
   Check or uncheck the “Use a background service to install updates” option as desired.

From about:config Menu:

   Type “about:config” in the address bar, then press “Enter“.
   Search for the “app.update.auto” setting.
   Double-click the “app.update.auto” option to toggle the setting. If set to “true“, automatic updates are enabled. If set to “false“, automatic updates are disabled.

If this solved your problem, please mark as solution!

Mkll said

Hello, heres how to turn off automatic updating: From Firefox Menus: Select the “Menu” Button button in the upper-right corner, then choose “Options“. Select “Advanced“. Choose the “Update” tab. Select one of the following options as desired: Automatically install updates Check for updates, but let me choose whether to install them Never check for updates Check or uncheck the “Use a background service to install updates” option as desired. From about:config Menu: Type “about:config” in the address bar, then press “Enter“. Search for the “app.update.auto” setting. Double-click the “app.update.auto” option to toggle the setting. If set to “true“, automatic updates are enabled. If set to “false“, automatic updates are disabled. If this solved your problem, please mark as solution!

IT DOESN'T work, i'm so mad!! :(

Switch to 52 ESR so you can stay secure with security updates without losing the look you love so much until May 2018, get it from here: https://www.mozilla.org/en-US/firefox/organizations/all/