We know about most of the oddities like crackling sound for some emulators, rendering issues, and games unreliably auto launching to fullscreen. In general full CD games on the Xbox web browser do not seem to work due to their size if you have a chd/pbp less than 450 megs it will run. Edge on Xbox has some kind of undocumented ram limitation of about a gigabyte. Until all emulators are transitioned to libretro cores the oddities of using self hosted EmulatorJS will not be something that can or should be solved using hacky workarounds interacting with obfuscated code. Just keep in mind these are full blown machine emulators running in Javascript in a browser, do not expect bare metal performance.