Examine source code of Noice Noise

{
  "manifest_version": 2,
  "name": "Noice Noise",
  "description": "Brown, pink, and white noise generator to help concentration",
  "version": "0.0.3",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon32.png",
    "default_title": "Noice Noise",
    "default_popup": "index.html"
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "page": "offscreen.html",
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7f51b1ca-3d6c-463e-a38b-78401ad363d5}"
    }
  }
}