Examine source code of Go Fetch

{
  "name": "Go Fetch",
  "description": "Customize shortcut keywords to quickly access multiple websites.",
  "version": "1.0.3",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "52.0a1",
      "id": "{39feba3b-61d9-4851-a3e9-1506da800eac}"
    }
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "omnibox": {
    "keyword": "go"
  },
  "manifest_version": 2,
  "icons": {
    "16": "images/patch-16.png",
    "32": "images/patch-32.png",
    "48": "images/patch-48.png",
    "96": "images/patch-96.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/patch-16.png",
      "32": "images/patch-32.png",
      "48": "images/patch-48.png",
      "96": "images/patch-96.png"
    }
  }
}