Examine source code of SSynch

{
  "manifest_version": 3,
  "name": "SSynch",
  "version": "1.0.1",
  "description": "Watch any video in sync with other people, in real time.",
  "permissions": [
    "alarms",
    "storage",
    "tabs",
    "clipboardWrite"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "service-worker-loader.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "js": [
        "assets/content.js-AsWutA7L.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_title": "SSynch",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_popup": "src/sidepanel.html"
  },
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "assets/content.js-AsWutA7L.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ssynch@emilvdijk.github.io",
      "strict_min_version": "127.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteActivity"
        ]
      }
    }
  }
}