Examine source code of History Graph

{
  "manifest_version": 3,
  "name": "History Graph",
  "description": "Visualize your browsing history as a graph.",
  "permissions": [
    "webNavigation",
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_title": "Open History Graph",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "128": "icon.svg"
  },
  "version": "0.0.3",
  "sidebar_action": {
    "default_panel": "viewer.html?panel=1",
    "default_title": "History Graph",
    "default_icon": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "history-graph@chuckdries",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}