

Interesting, funny enough I have sorta the opposite problem using Firefox for PDFs: I like the side by side view of two pages and Firefox always loads books with single pages, zoomed way too far in for my taste. Have you tried it for PDFs recently? It’s a new way of reading them for me, and I wonder if they’ve changed it since you used it last.
The flatpak version can have issues integrating with the system, while the native install generally has fewer issues. These issues can crop both in the steam client and in the games themselves (since those processes are also sandboxed).
I personally can’t use the flatpak version on my desktop (Fedora 42) because I can’t get hardware acceleration working on the flatpak client and it’s unusably slow. Other issues I’ve heard about with the games themselves running poorly also makes me disinclined to even try to fix it.
That being said, Fedora has a nicely packaged native install for the steam client, maybe if I had to manage the dependencies more I would feel differently.