A quick search says there are 55,000 games on Steam. 19,000 is just over a third of all Steam games guaranteed to work on Linux with no issues.

Zen is based on Firefox, it supports 100% of firefox addons, as well as supporting its own community mods system for changing the browser itself

Zen is literally the best browser around right now, I do understand the UI isn’t for everybody but if you vibe with it, it rocks