Examine source code of Tabook

{
  "manifest_version": 3,
  "name": "Tabook",
  "version": "2.1.0",
  "author": "contact-project+captain-crash-tabook-63145054-issue-@incoming.gitlab.com",
  "description": "A New Tab page which displays a selection of your bookmarks.",
  "homepage_url": "https://gitlab.com/captain-crash/tabook",
  "chrome_url_overrides": {
    "newtab": "dist/index.html"
  },
  "chrome_settings_overrides": {
    "homepage": "dist/index.html"
  },
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "host_permissions": [
    "https://tabook-backend-985260041863.europe-west1.run.app/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tabook-captain-crash@gitlab.com",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png"
  }
}