Alternativ till ZapFocus för Firefox med kommersiell licens

• Firefox
  Alla plattformar Windows Mac Linux Chrome OS Android iPhone Blackberry 10 Apple Watch Android Wear iPad Android Tablet Kindle Fire PlayBook Web Self-Hosted Software as a Service (SaaS) Firefox Windows Mobile Chrome Microsoft Office 365 Microsoft Azure Microsoft SharePoint Install Chrome Extensions Google Chrome to Phone
• Kommersiell licens
  Eventuell licens Gratis licens Open Source-licens Kommersiell licens