Examine source code of Text Case Converter Pro

{
  "manifest_version": 2,
  "name": "Text Case Converter Pro",
  "version": "1.0",
  "description": "Convert text to different cases.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a14d614b-f565-4f89-9a6d-44166b465a4d}"
    }
  }
}