Ok thanks yeah it was a .deb package. It says it in the command where I installed the repository. I thought all packages were supposed to be either snap or flatpak but now I understand.

Ok I installed it using the commands for Ubuntu. So it was a .deb package

I’ve only installed browsers with commands from their official website and I’ve also installed flatpaks.

I’m not sure if stock Firefox on Zorin is a flatpak or snap but it has no problem rendering the CSS.

deleted by creator