Examine source code of Game Recommender

{
  "manifest_version": 2,
  "name": "Game Recommender",
  "version": "1.1",
  "description": "A Firefox extension that tracks user preferences and recommends video games.",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "https://api.rawg.io/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "options_ui": {
    "page": "popup.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c36330bd-fe27-4abf-90ec-84aff5f3ce2c}"
    }
  }
}