Examine source code of ReadAloud

{
  "manifest_version" : 2 ,
  "name" : "ReadAloud",
  "version" : "0.1.1",
  "description" : "Text-to-speech overlay with click-to-read and word-by-word highlighting.",
  "homepage_url" : "https://github.com/sirbuggington/readaloud-firefox",
  "permissions" : [
    "storage" ,
    "identity" ,
    "<all_urls>" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "navigation.js" ,
        "content.js" 
      ],
      "css" : [
        "content.css" 
      ],
      "run_at" : "document_idle" ,
      "all_frames" : false 
    }
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ],
    "persistent" : false 
  },
  "browser_action" : {
    "default_title" : "Toggle ReadAloud overlay",
    "default_icon" : {
      "48" : "icons/icon.svg",
      "96" : "icons/icon.svg"
    }
  },
  "icons" : {
    "48" : "icons/icon.svg",
    "96" : "icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "readaloud-vtt-20260824@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteContent"
        ]
      }
    }
  }
}