Examine source code of Browsing History Graph

{
  "manifest_version": 3,
  "name": "Browsing History Graph",
  "version": "1.11",
  "description": "Visualizes browsing history as a directed multigraph",
  "permissions": [
    "tabs",
    "webNavigation",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "icon.svg",
      "48": "icon.svg",
      "128": "icon.svg"
    },
    "default_title": "Browsing History Graph",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "browsing-history-graph@example.com"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}