netflix-international/content_script.js

script_urls = [];

urls = [
    'netflix_max_bitrate.js'
];

// https://stackoverflow.com/a/45985333
function getBrowser() {
	if (typeof chrome !== "undefined") {
		if (typeof browser !== "undefined") {
			return "Firefox";
		} else {
			return "Chrome";
		}
	} else {
		return "Edge";
	}
}

// promisify chrome storage API for easier chaining
function chromeStorageGet(opts) {
    if (getBrowser() == "Firefox") {
        return chrome.storage.sync.get(opts);
    }
    else {
        return new Promise(resolve => {
            chrome.storage.sync.get(opts, resolve);
        });
    }
}

function attachScript(resp) {
    let xhr = resp.target;
    let mainScript = document.createElement('script');
    mainScript.type = 'application/javascript';
    if (xhr.status == 200) {
        mainScript.text = xhr.responseText;
        document.documentElement.appendChild(mainScript);
    }
}

chromeStorageGet({
    use6Channels: true,
    showAllTracks: true,
    setMaxBitrate: false,
    disableVP9: false,
}).then(items => {
    // very messy workaround for accessing chrome storage outside of background / content scripts
    let mainScript = document.createElement('script');
    mainScript.type = 'application/javascript';
    mainScript.text = `var globalOptions = JSON.parse('${JSON.stringify(items)}');`; 
    document.documentElement.appendChild(mainScript);
}).then(() => {
    // attach and include additional scripts after we have loaded the main configuration
    for (let i = 0; i < script_urls.length; i++) {
        let script = document.createElement('script');
        script.src = script_urls[i];
        document.documentElement.appendChild(script);
    }

    for (let i = 0; i < urls.length; i++) {
        let mainScriptUrl = chrome.extension.getURL(urls[i]);
        let xhr = new XMLHttpRequest();
        xhr.open('GET', mainScriptUrl, true);
        xhr.onload = attachScript;
        xhr.send();
    }
});