Examine source code of DICOM viewer extension

{
  "name": "DICOM viewer extension",
  "description": "Extension for arranging web browser windows and tabs for smoother user experience in DICOM viewer application.",
  "author": "Bigroot Software a.s.",
  "version": "1.2.0",
  "manifest_version": 3,
  "icons": {
    "16": "/icon_16.png",
    "32": "/icon_32.png",
    "48": "/icon_48.png",
    "128": "/icon_128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/icon_16.png",
      "32": "/icon_32.png",
      "48": "/icon_48.png",
      "128": "/icon_128.png"
    }
  },
  "background": {
    "scripts": [
      "/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "/contentscript.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "tabs",
    "activeTab",
    "scripting",
    "nativeMessaging"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dicom-viewer@bigroot.software",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}