Examine source code of Pop-a-loon

{
  "manifest_version": 3,
  "name": "Pop-a-loon",
  "description": "The new rising trend (literally) that changes the browser game completely.",
  "permissions": [
    "storage",
    "alarms",
    "idle",
    "scripting"
  ],
  "host_permissions": [
    "https://*/*",
    "http://*/*"
  ],
  "icons": {
    "16": "./resources/icons/icon-16.png",
    "24": "./resources/icons/icon-24.png",
    "32": "./resources/icons/icon-32.png",
    "48": "./resources/icons/icon-48.png",
    "128": "./resources/icons/icon-128.png"
  },
  "action": {
    "default_icon": {
      "16": "./resources/icons/icon-16.png",
      "24": "./resources/icons/icon-24.png",
      "32": "./resources/icons/icon-32.png",
      "48": "./resources/icons/icon-48.png",
      "128": "./resources/icons/icon-128.png"
    },
    "default_title": "Pop-a-loon",
    "default_popup": "./popup.html"
  },
  "web_accessible_resources": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "resources": [
        "resources/**/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "version": "1.21.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "pop-a-loon@pop-a-loon"
    }
  }
}