Examine source code of GraphiTab

{
  "manifest_version": 3,
  "name": "GraphiTab",
  "description": "GraphiQL in a Tab",
  "version": "0.3.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "homepage_url": "https://github.com/jayclassless/graphitab",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "incognito": "split",
  "browser_specific_settings": {
    "gecko": {
      "id": "@graphitab.classless.net",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "GraphiTab",
    "default_popup": "popup.html"
  },
  "devtools_page": "devtools.html"
}