Examine source code of TLS Lens

{
  "manifest_version": 2,
  "name": "TLS Lens",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "version": "1.4",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "clipboardWrite",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "TLS Lens",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "lib/asn1-parser.js",
      "background.js"
    ]
  },
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "tls-lens@appoldt.de",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}