Examine source code of JsonDiscovery

{
  "version": "1.14.1",
  "name": "JsonDiscovery",
  "short_name": "JsonDiscovery",
  "description": "Browser extension that changes the way you're viewing JSON",
  "author": "exdis",
  "manifest_version": 2,
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "content_scripts": [
    {
      "js": [
        "init.js"
      ],
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "discovery.css",
    "discovery.js",
    "discovery-esm.js",
    "preloader.css",
    "icons/*",
    "assets/*"
  ],
  "applications": {
    "gecko": {
      "id": "jsondiscovery@exdis.me",
      "strict_min_version": "57.0"
    }
  }
}