Hello Dave,

Nothing to worry about, but pretty annoying .....

You probably have something like Avast installed  ?

Would you please take a look at this :

https://techdows.com/2019/06/fix-firefox-says-your-browser-is-being-managed-by-your-organization.html

If you do have some security software installed :

You're best off with just using Windows built-in Defender and maybe let malwarebytes run a scan once a month.

Also see :

https://www.howtogeek.com/239950/dont-use-your-antivirus-browser-extensions-they-can-actually-make-you-less-safe/

And :

http://tech.firstpost.com/news-analysis/ex-mozilla-firefox-developer-says-anti-virus-software-does-more-harm-than-good-359798.html

Thank You.

You can check the about:policies#active page to see whether policies are active.

• https://support.mozilla.org/en-US/kb/see-active-policies-firefox-enterprise

You can inspect the Mozilla and Firefox keys with the Windows Registry Editor in HKEY_LOCAL_MACHINE and possibly in HKEY_CURRENT_USER with the Windows Registry Editor to see whether GPO policy rules are active.

• HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Firefox\

Note that the mere presence of the "Mozilla\Firefox\" key is sufficient to make Firefox display this notification, so if you have the Firefox key then remove it and only leave the Mozilla key or remove this key as well if it is empty.

• HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Firefox\ =>
  HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\