Examine source code of LinkFlags - Preview Signals Beside Links

{
  "manifest_version": 3,
  "name": "LinkFlags - Preview Signals Beside Links",
  "version": "2.4.0",
  "description": "Shows read time, image-heavy, code-heavy and paywall flags next to Google Search links before you click.",
  "browser_specific_settings": {
    "gecko": {
      "id": "linkflags@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://*/*",
    "http://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; connect-src https://* http://* https://us.i.posthog.com"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/LinkFlags_16_v2-3.png",
      "32": "assets/LinkFlags_32_v2-3.png",
      "48": "assets/LinkFlags_48_v2-3.png",
      "128": "assets/LinkFlags_128_v2-3.png"
    }
  },
  "icons": {
    "16": "assets/LinkFlags_16_v2-3.png",
    "32": "assets/LinkFlags_32_v2-3.png",
    "48": "assets/LinkFlags_48_v2-3.png",
    "128": "assets/LinkFlags_128_v2-3.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/search*",
        "https://www.bing.com/search*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ]
}