Examine source code of Game Hub Launcher

{
  "manifest_version": 2,
  "name": "Game Hub Launcher",
  "version": "1.0",
  "description": "Launch your favorite web games quickly from the browser popup!",
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon48.png",
    "default_title": "Game Hub Launcher",
    "default_popup": "popup.html"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6c01ce1d-8664-4845-9aad-6dca869457cb}"
    }
  }
}