Examine source code of Happy Squid

{
  "manifest_version": 3,
  "name": "Happy Squid",
  "version": "0.1.9",
  "description": "World's first intelligent website blocker",
  "icons": {
    "16": "icons/tilted/icon-16.png",
    "32": "icons/tilted/icon-32.png",
    "48": "icons/tilted/icon-48.png",
    "128": "icons/tilted/icon-128.png"
  },
  "permissions": [
    "declarativeNetRequest",
    "storage",
    "unlimitedStorage",
    "alarms",
    "webNavigation",
    "identity",
    "nativeMessaging"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "src/background/index.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/view/content/index.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "src/view/popup/index.html",
    "default_icon": {
      "16": "icons/tilted/icon-16.png",
      "32": "icons/tilted/icon-32.png"
    }
  },
  "options_page": "src/view/options/index.html",
  "web_accessible_resources": [
    {
      "resources": [
        "src/view/blocked/index.html",
        "embedded-blocked.html",
        "octopus.png",
        "squids/happy.svg",
        "squids/noface.svg",
        "fonts/inter-latin-400-normal.woff2",
        "fonts/inter-latin-600-normal.woff2"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "happy-squid@happy-squid-blocker.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteContent",
          "personallyIdentifyingInfo"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}