after some digging in the unzipped .xpi file its effectively dormant and safe to use now, but it does not work obviously lol. there is no way to generate free robux, it was made a while ago so the site that the javascript makes requests to (irobux.org) doesn't even exist anymore so its pretty much useless. i only installed it to make a review you can install it or curl the download url that ends in .xpi if you wanna reverse engineer it too :)