Examine source code of Real-Time Unit Converter

{
  "manifest_version": 2,
  "name": "Unit Converter",
  "version": "1.0",
  "description": "A simple browser extension for converting units.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "src/popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "src/icons/conversion-icon-circular.jpg",
    "32": "src/icons/conversion-icon-circular.jpg",
    "48": "src/icons/conversion-icon-circular.jpg",
    "128": "src/icons/conversion-icon-circular.jpg"
  },
  "applications": {
    "gecko": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ddf5b8b-3c91-4f88-9137-2f8eef0cb887}"
    }
  }
}