Solved Firefox patched to not send a user agent string?

When I visit web site to see my user agent, I get an empty string (empty window).
I am using firefox 89.0.2,2. (64 bits) in FreeBSD 13.0-RELEASE-p3.

I am a bit surprised, I was expecting it to present itself as a FreeBSD OS.

I care because my mail website (I am unsure it is ok to mention which here),
does not work. By using a spoofing user-agent extension, I am able to have the website shows the sign-in button, but in FreeBSD, opening it shows an empty page.
 
Setting the user agent in Firefox has nothing to do with the OS. So you can just google "reset user agent in firefox".

Your current user agent is shown if you type about:support in the address bar.
 
Thanks, I erased user.agent.override, and now it works! I tried to break it again by desinstalling firefox, and reinstalling... but it kept working (for that)... I have a more important problem now that I wrote in a different thread (waiting approbation).
 
Get spoofy wit it.
facts01.jpg
 
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