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Ok, I can understand what do you say.
I've never used librewolf, I only use degoogled Chromium but, for the moment, I never care about the browser presentation.

Probably, in next future I'll take a look about this.

For the moment I only happened to force the way my smartphone browser presented itself to the website.
I happened to have to force the desktop and windows mode to be able to access some content accessible only at this kind of agents.