Examine source code of TitlePop

{
  "manifest_version": 2,
  "name": "TitlePop",
  "version": "1.2",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "permissions": [
    "activeTab",
    "menus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background/init.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/pop.js"
      ],
      "css": [
        "content/modal.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true,
    "browser_style": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5acb2c0f-7943-4c9d-b8d3-8e3bbf4157b8}"
    }
  }
}