Examine source code of Speak the Selection — Read Aloud TTS

{
  "manifest_version" : 3 ,
  "name" : "Speak the Selection — Read Aloud TTS",
  "version" : "2.1",
  "description" : "Speak the Selection lets you highlight any text on the web and hear it read aloud with HD AI voices from ElevenLabs, Hume for free",
  "permissions" : [
    "storage" ,
    "contextMenus" ,
    "offscreen" ,
    "scripting" ,
    "downloads" ,
    "clipboardRead" ,
    "alarms" 
  ],
  "host_permissions" : [
    "<all_urls>" 
  ],
  "background" : {
    "service_worker" : "background.js" ,
    "type" : "module" ,
    "scripts" : [
      "background.js" 
    ]
  },
  "action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "icons/icon16.png",
      "32" : "icons/icon32.png",
      "48" : "icons/icon48.png",
      "128" : "icons/icon128.png"
    }
  },
  "content_security_policy" : {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "icons" : {
    "16" : "icons/icon16.png",
    "32" : "icons/icon32.png",
    "48" : "icons/icon48.png",
    "128" : "icons/icon128.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "content.js" 
      ]
    }
  ],
  "web_accessible_resources" : [
    {
      "resources" : [
        "player.css" ,
        "loading.css" 
      ],
      "matches" : [
        "<all_urls>" 
      ]
    },
    {
      "resources" : [
        "modules/*.js" ,
        "shared/*.js" 
      ],
      "matches" : [
        "<all_urls>" 
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "speak-the-selection@softreviewed.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "author": "SoftReviewed",
  "homepage_url" : "https://softreviewed.com"
}