Alternativas ao Sumo para Firefox com licença comercial

• Firefox
  Todas as plataformas Windows Mac Linux Android iPhone Windows Phone iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) Firefox Opera Safari Internet Explorer jQuery Wordpress Facebook Shopify Chrome Joomla Magento Community Edition Twitter Squarespace WooCommerce Drupal LinkedIn Weebly Intercom WordPress.com Tumblr Instapage Songbird Swift Social
• Licença comercial
  Qualquer licença Licença gratuita Licença Open Source Licença comercial