Examine source code of Bookmarks-modifier

{
  "manifest_version": 2,
  "name": "Bookmarks-modifier",
  "version": "1.0.3",
  "description": "Manager for bookmark",
  "icons": {
    "96": "icons/logo96.png"
  },
  "browser_action": {
    "default_icon": "icons/logo96.png",
    "default_title": "Bookmarks-modifier",
    "default_popup": "menu.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bookmark-manager@yo",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "bookmarks"
  ]
}