No idea honestly, I have no experience with Fedora and this toolkit seems to be designed for Steam Deck. At this point I’d try looking for an answer in the toolkits source files - it’s all essentially a bunch of bash scripts moving files around between Proton prefixes, AFAIK
I have been toying with the idea of forking Servo to make a scriptable keyboard-driven browser, like Nyxt but with something else instead of Lisp.
Probably too huge of a project for one hooman though.