New
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Have you disabled updates? If so, it would likely be due to this...
Latest Firefox Released for Windows - Page 151 - Windows 10 ForumsNever check for updates is one setting I want. As soon as I realized that Mozilla got rid of it, I searched for instructions on how to disable automatic updates. And there they were...
...After applying the policy, this is what you ll see ... in Firefox Options...
The 'organisation' message is from Firefox, not Windows. The tweak that produced the message in Firefox is to a policies.json file a directory called distribution within the Firefox installation directory. See the post I linked to for more details, and links to further information about Firefox policies.
Latest Firefox Released for Windows - Page 151 - Windows 10 Forums