Examine source code of Replay Loop

{
  "manifest_version": 2,
  "name": "Replay Loop",
  "description": "Set A/B markers on the current video and drill that fragment on repeat. One click to pause or clear the loop.",
  "version": "4.5.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdcde0e7-2909-4d1e-99ad-5c32bf54192e}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "assets/icon-32.png",
    "48": "assets/icon-48.png",
    "64": "assets/icon-64.png",
    "96": "assets/icon-96.png",
    "128": "assets/icon-128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Replay Loop",
    "default_popup": "core/popup.html",
    "default_icon": {
      "32": "assets/icon-32.png",
      "48": "assets/icon-48.png",
      "64": "assets/icon-64.png",
      "96": "assets/icon-96.png",
      "128": "assets/icon-128.png"
    }
  }
}