Examine source code of Roblox Playtime

{
  "manifest_version": 2,
  "name": "Roblox Playtime",
  "version": "1.1",
  "description": "Adds a weekly playtime counter to Roblox game pages using the parental controls API.",
  "permissions": [
    "cookies",
    "https://www.roblox.com/*",
    "https://apis.roblox.com/*",
    "https://games.roblox.com/*"
  ],
  "icons": {
    "48": "icons/48.png"
  },
  "incognito": "not_allowed",
  "background": {
    "scripts": [
      "dist/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.roblox.com/games/*"
      ],
      "js": [
        "dist/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{492669a6-4e3b-4772-b12d-099004efd681}"
    }
  }
}