file_indexedDB.html

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<!DOCTYPE html>

<html lang="en">

  <head>

    <meta charset="utf-8">

    <script>

"use strict";

const objectStoreName = "Objects";

let test = {key: 0, value: "test"};

let request = indexedDB.open("WebExtensionTest", 1);

request.onupgradeneeded = event => {

  let db = event.target.result;

  let objectStore = db.createObjectStore(objectStoreName,

                                         {autoIncrement: 0});

  request = objectStore.add(test.value, test.key);

  request.onsuccess = () => {

    db.close();

    window.postMessage("indexedDBCreated", "*");

};

};

    </script>

  </head>

  <body>

    This is a test page.

  </body>

<html>