This version is Windows-only and requires the Edge Webview, and hardware-accelerated web browsers don't play nice under Wine/Proton.
I hope a fully cross-platform release when this desktop version comes out of beta.
Fan-made 2D Mario level designer · By
WinRarisyou made a Desktop Mod Manager on github https://github.com/WINRARisyou/SMC-Desktop-Mod-Manager
In case you were still looking, I released the latest version of the web mod loader here:
LSS Web Mod Loader - Chrome Web Store
And you can find some mods for it here:
LSS WML mods & resources - Google Drive