Alternativas ao iReader extension para Firefox com licença de código aberto

• Firefox
  Todas as plataformas Windows Mac Linux Android iPhone Windows Phone Blackberry Apple Watch iPad Android Tablet Kindle Fire Web Self-Hosted Software as a Service (SaaS) Firefox Opera Safari Waterfox Pale Moon Chrome
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial