Alternativa Viulyu za Firefox sa besplatnom licencom

• Firefox
  Sve platforme Windows Mac Chrome OS Android iPhone Windows Phone Blackberry Blackberry 10 Apple Watch Android Wear iPad Android Tablet Kindle Fire Windows S PlayBook Web Software as a Service (SaaS) Firefox Fire TV Chromecast Roku Windows Mobile Apple TV Chrome
• Besplatna licenca
  Bilo koja licenca Besplatna licenca Licenca otvorenog koda Komercijalna licenca