Examine source code of Bookmarks start page

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.1.2",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "author": "Romain Vigier",
  "homepage_url": "https://gitlab.com/rmnvgr/bookmarks-start-page-firefox-extension",
  "applications": {
    "gecko": {
      "id": "bookmarks-start-page@romainvigier.fr"
    }
  },
  "icons": {
    "64": "icon.png"
  },
  "chrome_url_overrides": {
    "newtab": "assets/index.html"
  },
  "chrome_settings_overrides": {
    "homepage": "assets/index.html"
  },
  "permissions": [
    "<all_urls>",
    "bookmarks",
    "storage"
  ]
}