Don’t do this. It will override the user agent for every site you visit which will cause a lot of problems, like failing most captchas and breaking a lot of websites.

You should use an extension (like this one) to change UA on a per site basis instead.

The same thing happened to me, so I switched to the flatpak version and it works well.

I thought he used GNOME on Fedora?

Dublin, Ireland here. Always drank water straight from the tap. Unless there is some kind of issue with the water system in your area, then a notice will be put out to tell people to boil water before drinking.