How To Change User Agent In Firefox Without Extensions

In this video, I'll show you how to set the default user agent in Firefox. No extensions needed.

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CREDITS

Music
cxlt. - Above The Quiet City
Provided by Lofi Girl

[brutal]

Fixed the youtube Firefox throttling. You're a legend

[dead_head]

This should fix the new issue with Google intentionally, artificially, unethically, immorally, and illegally slowing down YouTube playback for non-Chromium browsers.

[jrssm]

Any idea if you can do this for one site only?
An app I need for Uni is chrome only, however works fine with a U/A change.
I’d like to make Firefox always use a different UA with this site only.

[HarrisonBorbarrison]

Thankyou very much! I always get scared though when I go to about:config !

[Multowz]

how to add user agent per site basis? for example i only want to switch to edge when i go to bing

[alexhunter-meier]

remember, corporations never think of mutual humanity growth, all they think is their own stocks growth

[jestekrytykie]

Hello. Are there any other ovveride measures? Because it looks like some sites can still detect my real agent.