Examine source code of History Porter

{
  "author": "igorlogius",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_area": "navbar"
  },
  "description": "Import or export your browsing history",
  "homepage_url": "https://github.com/igorlogius/webextensions/tree/main/history-porter",
  "icons": {
    "128": "icon.png"
  },
  "incognito": "not_allowed",
  "manifest_version": 2,
  "options_ui": {
    "browser_style": true,
    "open_in_tab": true,
    "page": "options.html"
  },
  "name": "History Porter",
  "permissions": [
    "history"
  ],
  "version": "1.0.5",
  "browser_specific_settings": {
    "gecko": {
      "id": "{99a5f72f-f948-477b-860f-2ebb6f2398fa}"
    }
  }
}