Examine source code of Urql Devtools

{
  "manifest_version": 2,
  "name": "Urql Devtools",
  "description": "The official Urql chrome extension",
  "icons": {
    "16": "/assets/icon-16.png",
    "32": "/assets/icon-32.png",
    "48": "/assets/icon-48.png",
    "64": "/assets/icon-64.png",
    "128": "/assets/icon-128.png",
    "256": "/assets/icon-256.png",
    "512": "/assets/icon-512.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "page_action": {
    "default_title": "Urql Devtools",
    "default_icon": {
      "32": "/assets/icon-disabled-32.png",
      "64": "/assets/icon-disabled-64.png",
      "128": "/assets/icon-disabled-128.png"
    }
  },
  "devtools_page": "devtools.html",
  "permissions": [
    "file:///*",
    "http://*/*",
    "https://*/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "application": {
    "gecko": {
      "id": "{c11f3a69-f159-4708-b044-853066c2d2fe}",
      "strict_min_version": "42.0"
    }
  },
  "version": "2.6.2"
}