Examine source code of GPX Viewer

{
  "name": "GPX Viewer",
  "version": "1.0.2",
  "default_locale": "en_US",
  "manifest_version": 2,
  "description": "View your GPX files quickly from Google Drive or local computer.",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "64": "icon-64.png",
    "96": "icon-96.png",
    "128": "icon-128.png",
    "256": "icon-256.png",
    "512": "icon-512.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png",
      "64": "icon-64.png",
      "96": "icon-96.png",
      "128": "icon-128.png",
      "256": "icon-256.png",
      "512": "icon-512.png"
    }
  },
  "background": {
    "scripts": [
      "launch.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "{bde69c81-a97c-41cc-9c1b-39420a2da340}",
      "strict_min_version": "57.0"
    }
  }
}