Add support for chrome browsers

options/options.js

@@ -1,6 +1,6 @@
 function saveOptions(e) {
   e.preventDefault();
-  browser.storage.local.set({
+  chrome.storage.local.set({
     local: document.querySelector("#local").value,
     test: document.querySelector("#test").value,
     prod: document.querySelector("#prod").value,
@@ -14,12 +14,7 @@ function restoreOptions() {
     document.querySelector("#prod").value = restoredSettings.prod || "";
   }
 
-  function onError(error) {
-    console.log(`Error: ${error}`);
-  }
-
-  const gettingStoredSettings = browser.storage.local.get();
-  gettingStoredSettings.then(updateUI, onError);
+  chrome.storage.local.get(null, updateUI);
 }
 
 document.addEventListener("DOMContentLoaded", restoreOptions);