Examine source code of Single html downloader

{
  "manifest_version": 2,
  "name": "__MSG_title__",
  "description": "__MSG_about__",
  "author": "TNK Software / Tanaka Yusuke",
  "homepage_url": "https://www.tnksoft.com/",
  "version": "2.8.1",
  "default_locale": "en",
  "icons": {
    "16": "res/icon16.png",
    "32": "res/icon32.png",
    "64": "res/icon64.png",
    "128": "res/icon128.png"
  },
  "options_page": "setting/index.htm",
  "options_ui": {
    "page": "setting/index.htm",
    "open_in_tab": true
  },
  "background": {
    "persistent": true,
    "scripts": [
      "util.js",
      "background.js",
      "convert.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "res/icon16.png",
      "32": "res/icon32.png",
      "64": "res/icon64.png",
      "128": "res/icon128.png"
    },
    "default_title": "__MSG_title__"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "util.js",
        "start.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    },
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "idle.js"
      ],
      "css": [
        "popup.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "contextMenus",
    "downloads",
    "http://*/*",
    "https://*/*"
  ]
}