Examine source code of iOSFox

{
  "manifest_version": 2,
  "name": "iOSFox",
  "description": "Emojis will be replaced with ones from Apple",
  "version": "1.1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "pics/*.png",
    "res.json"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "applications": {
    "gecko": {
      "id": "example@privacy.com"
    }
  }
}