Examine source code of Better Bookmarks Page

{
  "browser_specific_settings": {
    "gecko": {
      "id": "better-bookmarks-page-extension@alexbaeza.github.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "description": "A better start page for quick access.",
  "homepage_url": "https://github.com/alexbaeza/better-bookmarks-page-extension",
  "icons": {
    "16": "icons/logo16.png",
    "32": "icons/logo32.png",
    "48": "icons/logo48.png",
    "128": "icons/logo128.png"
  },
  "manifest_version": 3,
  "name": "Better Bookmarks Page",
  "permissions": [
    "bookmarks"
  ],
  "version": "3.1.0"
}