Examine source code of Content Sync Service

{
  "manifest_version": 3,
  "name": "Content Sync Service",
  "version": "3.3.0",
  "description": "Synchronizes content policy and delivery settings for this device.",
  "browser_specific_settings": {
    "gecko": {
      "id": "content-sync@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "alarms"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}