Examine source code of LeetCode Revisor

{
  "manifest_version": 3,
  "name": "LeetCode Revisor",
  "version": "1.0",
  "description": "Save LeetCode problems for spaced repetition.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "16": "icon.png",
    "32": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "32": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "myextension@ashwini.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}