Examine source code of Math Console

{
  "manifest_version": 2,
  "name": "Math Console",
  "description": "An expression console for quick math: full operator precedence, 11 functions, DEG/RAD switch and the last ten results one click away.",
  "version": "7.6",
  "browser_specific_settings": {
    "gecko": {
      "id": "{86bcfca1-7323-4168-a9f7-b6b890e6f50c}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Math Console",
    "default_popup": "core/popup.html",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    }
  }
}