Examine source code of Kitab

{
  "manifest_version": 2,
  "name": "Kitab",
  "version": "1.6.3",
  "description": "An alternative bookmark manager that can sync all your bookmarks across Chrome, Firefox, Edge and any Chrome-based browser.",
  "homepage_url": "https://kitab.one",
  "background": {
    "scripts": [
      "assets/index-306ef382.js"
    ]
  },
  "icons": {
    "128": "icons/bookmark_done128.png"
  },
  "browser_action": {
    "default_icon": "icons/bookmark_empty128.png",
    "default_popup": "popup/index.html"
  },
  "chrome_url_overrides": {
    "newtab": "kitab/index.html"
  },
  "permissions": [
    "identity",
    "activeTab",
    "https://*.kitab.one/api/*"
  ],
  "optional_permissions": [
    "tabs"
  ],
  "chrome_settings_overrides": {
    "homepage": "kitab/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6037836d-48f2-4bfa-9a77-730d14b6bd4d}"
    }
  }
}