How to remove User-Agent for Firefox
The goal is to remove this header from all web requests, in case you don't want sites to know which OS are you using.
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There is a way to do this without any addons:
general.useragent.overrideand an empty string as a value.
This way your browrer will not send any "User Agent" at all. You can check this by doing:
Ctrl Shift Q
P.S. Your browser may still be leaked if you have JS enabled for a site. This is because each browser has its own rendering capabilities, supported formats etc. The described steps remove "User-Agent" request headers, that's all.
I use an add-on for this, but only for specific websites that should treat me as a mobile device...
With Modify Headers you can try to fix your problem: https://addons.mozilla.org/de/firefox/addon/modify-headers/