Examine source code of Youtrack Custom Styles

{
  "manifest_version": 2,
  "name": "Youtrack Custom Styles",
  "version": "1.1",
  "description": "Melhora a usabilidade do editor de horas trabalhadas no YouTrack. Expande o modal para ocupar quase toda a tela e adiciona um seletor de textos padrão acima do editor, permitindo carregar templates pré-definidos com um clique.",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtrack-custom-styles@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtrack.cloud/*"
      ],
      "css": [
        "styles.css"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "https://*.youtrack.cloud/*"
  ]
}