Examine source code of Fairy Ring

{
  "manifest_version": 3,
  "name": "Fairy Ring",
  "author": "Danger Dev",
  "version": "0.13.4",
  "description": "A browser extension for fairylandgame.com",
  "browser_specific_settings": {
    "gecko": {
      "id": "fairyring@fairyring",
      "strict_min_version": "58.0"
    }
  },
  "action": {
    "default_title": "Fairy Ring",
    "default_popup": "src/options.html",
    "default_icon": "icons/mushroom16.png"
  },
  "icons": {
    "16": "icons/mushroom16.png",
    "48": "icons/mushroom48.png",
    "128": "icons/mushroom128.png"
  },
  "options_ui": {
    "page": "src/options.html",
    "open_in_tab": false
  },
  "permissions": [
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "https://www.fairylandgame.com/*"
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://www.fairylandgame.com/*"
      ],
      "css": [
        "src/notification/notifications.css"
      ],
      "js": [
        "src/jquery.js",
        "src/notification/notifications.js",
        "src/maxtimes.js",
        "src/mintimes.js",
        "src/defaults.js",
        "src/formatmessage.js",
        "src/garden.js",
        "src/homepage.js",
        "src/wildlifepage.js",
        "src/alchemy.js",
        "src/mushroomgame.js",
        "src/main.js"
      ]
    }
  ],
  "background": {
    "service_worker": "src/background.js",
    "scripts": [
      "src/background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "src/OnLoadListener.js"
      ],
      "matches": [
        "https://www.fairylandgame.com/*"
      ]
    },
    {
      "resources": [
        "icons/mushroom16notify.png",
        "icons/mushroom16.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}