Is UltraBlock - Adblock & Privacy Protection safe?

setTimeout(function () {  _getServicesFromAPI(tab.url);  if (samePageStillLoaded(tabSummary.hostname, i, tab.url)) {    markPageChecked(tabSummary.hostname, i);  }}, 1000);

const headers = new Headers();headers.append('Content-Type', 'application/x-www-form-urlencoded');headers.append('UltraBlock-UDID', settings.udid);headers.append('UltraBlock-Version', settings.version);const body =  'source=extension&request=getServices' +  '&protocol=' + encodeURIComponent(protocol) +  '&hostname=' + encodeURIComponent(hostname) +  '&pathname=' + encodeURIComponent(pathname) +  '&search=' + encodeURIComponent(search) +  '&hostnames=' + hostnamesCount +  '&services=' + servicesCount +  '&frames=' + framesCount +  '&cookies=' + cookiesCount;fetch(new Request('https://api.ultrablock.org/', { method: 'POST', headers, body }));

function _createDefaultSettings() {  try {    const manifest = _getBrowser().runtime.getManifest();    _settings = {      udid: _generateRandomUDID(),      version: manifest.version,      encryptionKey: "b8e0950f25d18e72",      clearCookieDomains: [],      clearCacheSince: false,      runningSince: 0,      deleteCookies: false,      sendDNT: true,      clearBrowserCache: true,      randomizeUserAgent: false,      disableUltraBlock: false,      shareData: false,      lastDatabaseUpdate: "2017-01-01",      knownServices: [],      knownUserAgents: [],      knownWhitelistedWebsites: [],      userDisallowedHostnames: []    };    console.log("%cDefault settings are restored.", "color: grey;");    _saveSettings();  } catch (error) {    console.log("%cError creating default settings", "color: red;");  }}

_getBrowser().cookies.onChanged.addListener(function(e) {  try {    if (!_activeTab || !_activeTab.id) return false;    const url = _activeTab.url;    const hostname = uri.getHostname(_activeTab.url);    const domain = uri.getDomain(hostname);    if (uri.validateHostname(hostname) == true) {      let cookieDomain = e.cookie.domain;      if (cookieDomain.startsWith(".") == true) cookieDomain = cookieDomain.substr(1);      let thirdPartyCookie = false;      if (cookieDomain != domain) thirdPartyCookie = true;      let domainFound = false;      if (_hostnames[hostname] != undefined) {        for (let i = 0; i < _hostnames[hostname].length; i++) {          const object = _hostnames[hostname][i];          if (object.domain == cookieDomain) {            domainFound = true;            break;          }        }      } else {        console.log("%cDropped the _hostname ball for " + hostname + ". (needs to be fixed).", "color: grey;");      }      if (thirdPartyCookie == false || thirdPartyCookie == true && domainFound == true) {        _insertCookieObject(url, hostname, cookieDomain, e.cookie.domain, e.cookie.name, e.cookie.value, e.cookie.secure, thirdPartyCookie);      }    }  } catch (error) {    console.log("%cError cookies changing", "color: red;");  }});

function _flushHostnames() {  try {    console.log("%cChecking if we need to do some flushing.", "color: grey;");    const activeTabHostnames = [];    for (const tabId in _tabs) {      const object = _tabs[tabId];      if (object && object.hostname) activeTabHostnames.push(object.hostname);    }    if (_validateUDID() == false) _updateUDID();    for (const hostname in _hostnames) {      if (activeTabHostnames.indexOf(hostname) == -1 && hostname != "") {        console.log("%cFlushing " + hostname + " (still " + activeTabHostnames.length + " active hostnames).", "color: green;");        const manifest = _getBrowser().runtime.getManifest();        if (_pages[hostname] == undefined) _pages[hostname] = [];        if (_services[hostname] == undefined) _services[hostname] = [];        if (_hostnames[hostname] == undefined) _hostnames[hostname] = [];        if (_frames[hostname] == undefined) _frames[hostname] = [];        if (_cookies[hostname] == undefined) _cookies[hostname] = [];        const rows = _pages[hostname].length + _services[hostname].length + _hostnames[hostname].length + _frames[hostname].length + _cookies[hostname].length;        if (rows > 0) {          const summary = {            source: "extension",            udid: _settings.udid,            version: manifest.version,            encryptionKey: _settings.encryptionKey,            url: _pages[hostname][0].url,            hostname: hostname,            domain: uri.getDomain(hostname),            pages: _pages[hostname],            services: _services[hostname],            hostnames: _hostnames[hostname],            frames: _frames[hostname],            cookies: _cookies[hostname],            rows: rows,            timestamp: _getTimestamp()          };          if (_settings.shareData == true) {            const data = JSON.stringify(summary);            const encryptedData = AES.enc(data, _settings.encryptionKey);            const dataLength = data.length;            const headers = new Headers();            headers.append("Content-Type", "application/x-www-form-urlencoded");            headers.append("UltraBlock-UDID", _settings.udid);            headers.append("UltraBlock-Version", _settings.version);            const requestUrl = "https://api.ultrablock.org/";            const requestBody = "source=extension&request=setSummaryFile&data=" + encodeURIComponent(encryptedData);            const request = new Request(requestUrl, { method: "POST", headers: headers, body: requestBody });            fetch(request).then(response => {              return response.json();            }).then(responseData => {              console.log("%cConnecting to UltraBlock API to send summary file.", "color: green;");              if (responseData.result == true) {                if (responseData.decryption == true) console.log("%cFlushed data received and decrypted by UltraBlock API contained in " + responseData.size + " bytes.", "color: green;");                else console.log("%cError: Decryption failed on server side.", "color: red;");              } else {                console.log("%cFailed to obtain response confirmation from UltraBlock API.", "color: red;");              }              console.log("%cFlushed data sent to UltraBlock API " + dataLength + " bytes.", "color: green;");            }).catch(error => {              console.log("%cError flushing data to UltraBlock API: " + error.message, "color: red;");              console.log(error);              console.log("%cAttempted to send " + dataLength + " bytes to " + requestUrl, "color: grey;");            });          } else {            console.log("%cSharing results is disabled.", "color: grey;");          }        }        if (_settings.disableUltraBlock == false && _settings.deleteCookies == true) {          for (let i = 0; i < _cookies[hostname].length; ++i) {            const object = _cookies[hostname][i];            const domain = uri.getDomain(object.cookieDomain);            if (object.thirdPartyCookie == true && _settings.clearCookieDomains.indexOf(domain) == -1) _settings.clearCookieDomains.push(domain);          }          _saveSettings();          _startCookieManager();        }        _clearBrowserCache();        delete _pages[hostname];        delete _hostnames[hostname];        delete _services[hostname];        delete _frames[hostname];        delete _cookies[hostname];      }    }  } catch (error) {    console.log("%cError flushing hostnames", "color: red;");  }}

function _updateSettings() {  setTimeout(() => {    const deleteCookies = _getElement("delete-cookies-checkbox");    const sendDnt = _getElement("send-dnt-checkbox");    const clearBrowserCache = _getElement("clear-browser-cache-checkbox");    const randomizeUserAgent = _getElement("randomize-user-agent-checkbox");    const shareData = _getElement("share-data-checkbox");    if (!_portSettings) _initializeConnection();    _portSettings.postMessage({      target: "ultrablock.background.js",      option: "updateSettingsFromSettings",      deleteCookies: deleteCookies.checked,      sendDNT: sendDnt.checked,      clearBrowserCache: clearBrowserCache.checked,      randomizeUserAgent: randomizeUserAgent.checked,      shareData: shareData.checked    });    console.log("%cUpdating settings via background script.", "color: green;");  }, 500);}

enc = function(string, pass, binary) {  const salt = randArr(8);  const pbe = openSSLKey(s2a(pass, binary), salt);  const key = pbe.key;  const iv = pbe.iv;  const saltBlock = [[83, 97, 108, 116, 101, 100, 95, 95].concat(salt)];  string = s2a(string, binary);  const cipherBlocks = rawEncrypt(string, key, iv);  return Base64.encode(saltBlock.concat(cipherBlocks));};dec = function(string, pass, binary) {  let cryptArr = Base64.decode(string);  const salt = cryptArr.slice(8, 16);  const pbe = openSSLKey(s2a(pass, binary), salt);  const key = pbe.key;  const iv = pbe.iv;  cryptArr = cryptArr.slice(16, cryptArr.length);  return rawDecrypt(cryptArr, key, iv, binary);};