I asked a friend who uses nobara and he says

Oh I know what they're running into

They're using the rpm which is copied from fedora upstream

Fedora ships with firefox by default and sets the home page to the fedoraproject site

Not sure what they're doing to trigger it to revert though

Nobara moved to chromium as the stock browser in order to have compatibility with steamdeck plugins, anyways

but all you do is just install firefox manually and go home

I'm not sure if that user is using the firefox rpm or flatpak

I use the flatpak with no issues, so

¯\(ツ)/¯

tl;dr as a solution for them, try the flatpak of firefox and see if it does the same thing

flatpaks have better security anyways, because they're sandboxxed away from being able to access the entire system

Top comment and comment thread from this reddit thread : https://www.reddit.com/r/Fedora/comments/mtyqj9/how_to_prevent_fedora_from_changing_firefox_start/

Probably the same thing.

An alternative is to install the flatpak version of firefox, that nobara wouldn't mess with.

Install the Flatpack version, easy fix.

I think I saw this question days before with a different title and less answers? Is that you? If so, glad you got help here.

Shit like this made me dump Mint more than a decade ago. I've been very happy with Debian (Sid).