So I'm surprised my Linux version doesn't work for you either.
I'm running Ubuntu 20.04 with FF 87.0 64-bit edition.
One thing to note, when you see a RPG Maker game with a package.json file in the root of game directory, that means it is using NW.js. You can try out different versions of the NW.js framework to see if it works for you. Download them from:
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Simply extract, then copy in the package.json and www directory. (If there's a scenario directory next to the www directory, you might need that as well, mainly for dieselmine games.)