Examine source code of Mistake Memory Quiz

{
  "manifest_version": 2,
  "name": "Mistake Memory Quiz",
  "version": "1.0.0",
  "description": "Only asks questions you previously answered incorrectly.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Mistake Memory Quiz"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "mistakememoryquiz@addon.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}