Is Netflix Dual subtitle for learning languages safe?

const logger = require(7434);const appName = require(8489).APP_NAME;function injectHeadScript() {  if (!document.querySelector("head")) return false;  const scriptId = `${appName}InsertJSToHead`;  if (document.getElementById(scriptId)) return false;  const file = "insert_to_head.min.js";  const script = document.createElement("script");  script.onload = function () {    logger.log(`Injected: ${file}  Epoch time: ${Date.now()}`);  };  script.async = false;  script.setAttribute("id", scriptId);  script.setAttribute("type", "text/javascript");  script.setAttribute("src", chrome.runtime.getURL(file));  document.head.appendChild(script);  return true;}const observer = new MutationObserver(function (mutations) {  mutations.forEach(function (mutation) {    mutation.addedNodes.forEach(function (node) {      if (node.nodeName.toLowerCase() === "head" || node.nodeName.toLowerCase() === "body") {        if (injectHeadScript()) observer.disconnect();      }    });  });});observer.observe(document, { childList: true, subtree: true });if (injectHeadScript()) observer.disconnect();window.addEventListener("DOMContentLoaded", function () {  ["insert.min.js"].forEach(function (file) {    const script = document.createElement("script");    script.onload = function () {      logger.log(`Injected: ${file}  Epoch time: ${Date.now()}`);    };    script.async = false;    script.setAttribute("type", "text/javascript");    script.setAttribute("src", chrome.runtime.getURL(file));    document.head.appendChild(script);  });});

"host_permissions": [  "https://www.netflix.com/*"],"content_scripts": [  {    "matches": [      "https://www.netflix.com/*"    ],    "js": [      "content.min.js"    ],    "run_at": "document_start"  }],"web_accessible_resources": [  {    "resources": [      "insert.min.js",      "insert_to_head.min.js"    ],    "matches": [      "https://www.netflix.com/*"    ]  }]

const googleCloudScriptId = `${secondarySubtitleWrapperId}GoogleCloudInsertMinJs`;new Promise(function (resolve) {  if (document.getElementById(googleCloudScriptId)) {    logger.log("Emergency update already exists");    resolve(false);    return;  }  new Promise(function (resolveManifest, rejectManifest) {    const xhr = new XMLHttpRequest();    xhr.responseType = "json";    xhr.open(      "GET",      "https://storage.googleapis.com/niko-extension/netflix-dual-subtitle-for-learning-languages/mv3/manifest.json",      true    );    xhr.timeout = 15000;    xhr.onload = function () {      if (xhr.status === 200) {        resolveManifest(xhr.response);      } else {        logger.error(`xhr manifest error: ${xhr.statusText} status: ${xhr.status}`);        rejectManifest();      }    };    xhr.onerror = function () {      logger.error(`xhr manifest error: ${xhr.statusText}`);      rejectManifest();    };    xhr.ontimeout = function () {      logger.error(`xhr manifest timeout: ${xhr.statusText}`);      rejectManifest();    };    xhr.send(null);  })    .then(function (manifest) {      if (manifest.update) {        logger.log("Emergency update is enabled");        resolve(true);      } else {        logger.log("Emergency update is not enabled");        resolve(false);      }    })    .catch(function () {      resolve(false);    });}).then(function (enabled) {  if (enabled) {    new Promise(function (resolve, reject) {      const url = "https://storage.googleapis.com/niko-extension/netflix-dual-subtitle-for-learning-languages/mv3/insert.min.js";      const script = document.createElement("script");      script.id = googleCloudScriptId;      script.onload = function () {        logger.log(`Injected: ${url}  Epoch time: ${Date.now()}`);        resolve();      };      script.onerror = function () {        logger.error("Emergency update failed to load");        reject();      };      script.setAttribute("type", "text/javascript");      script.setAttribute("src", url);      (document.head || document.documentElement).appendChild(script);    }).catch(function () {      startPackagedIntegration();    });  } else {    startPackagedIntegration();  }});