Examine source code of Morse Converter

{
  "manifest_version": 2,
  "name": "Morse Converter",
  "version": "1.0",
  "description": "Converts selected text to Morse code",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "48": "icons/icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{51c033f9-a74c-4c1c-bd59-d9343f5d4bda}"
    }
  }
}