Examine source code of Whenplane Widget

{
  "manifest_version": 3,
  "name": "Whenplane Widget",
  "short_name": "Whenplane",
  "version": "2.2.0",
  "description": "Replaces the floatplane/twitch offline box with a countdown from Whenplane",
  "homepage_url": "https://whenplane.com/extension",
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "about.html"
  },
  "icons": {
    "128": "icons/wan-128.png",
    "200": "icons/wan.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.floatplane.com/*"
      ],
      "js": [
        "inserter.js"
      ],
      "css": [
        "css/whenplane_styles.css"
      ]
    },
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "js": [
        "inserter.js"
      ],
      "css": [
        "css/whenplane_styles.css",
        "css/twitch.css"
      ]
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "inserter.js"
      ],
      "css": [
        "css/whenplane_styles.css"
      ]
    }
  ],
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "The WAN Show Search",
      "is_default": false,
      "search_url": "https://whenplane.com/search?q={searchTerms}",
      "keyword": "@wan",
      "encoding": "UTF-8",
      "favicon_url": "/icons/wan.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d7efb617-4782-4ca1-841e-f1fde210896b}"
    }
  }
}