Examine source code of Claws2

{
  "manifest_version": 3,
  "name": "Claws2",
  "version": "1.0.0",
  "description": "Screen Reader Simulator extension for accessibility studies of web pages",
  "default_locale": "es",
  "icons": {
    "16": "icons/Claws_Logo_TFG_16.png",
    "32": "icons/Claws_Logo_TFG_32.png",
    "48": "icons/Claws_Logo_TFG_48.png",
    "128": "icons/Claws_Logo_TFG_128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/Claws_Logo_TFG_128.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Claws2",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "contextMenus",
    "downloads"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "claws2@ua.com",
      "strict_min_version": "42.0"
    }
  }
}