Examine source code of Gaming Better

{
  "manifest_version": 2,
  "name": "FB Gaming Better ",
  "version": "0.3.6",
  "description": "Emotes + Chat Extension with Settings",
  "icons": {
    "128": "icons/ico.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "pages/menu.html"
  },
  "web_accessible_resources": [
    "content_new.css",
    "images/*",
    "pages/images/*",
    "pages/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.facebook.com/*"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "betterfbgaming@dopexz7",
      "strict_min_version": "57.0"
    }
  }
}