gistfile1.txt

import bcd from "@mdn/browser-compat-data" assert { type: "json" };

const support = bcd.webextensions.api;

function checkSupport(api, browser) {
	let total = Object.keys(support[api]).length;
	let supported = 0;
	for (const feature of Object.keys(support[api])) {
		if (support[api][feature]["__compat"]) {
			if (
				support[api][feature]["__compat"]["support"][browser][
					"version_added"
				] !== false
			) {
				supported++;
			}
		}
	}
	return {
		supported,
		total,
	};
}

for (const api of Object.keys(support)) {
	const { supported, total } = checkSupport(api, "firefox_android");
	console.log(`${api}: 
    ${supported} out of ${total}`);
}