Examine source code of ox: an app portal

{
  "manifest_version": 2,
  "name": "ox: an app portal",
  "description": "quick access to home page of ox.",
  "version": "1.0.0",
  "icons": {
    "128": "icon_128.png"
  },
  "action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e4ef6cf6-b7f2-4940-b02b-11513dcd1f48}"
    }
  }
}