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Firefox Add-On

What is Firefox?

Firefox is one of the most popular browsers in the world and convinces with user-friendly privacy settings and numerous add-ons.


To use the SMS gateway sms77io you need an API key. Sing up now!


  • Send text messages and make text-to-speech voice calls
  • Bulk message to all phone numbers of a page
  • Sending marked text from a web page
  • Specifying a signature
  • Determining the signature position
  • Determining fixed sender identification
  • Determining fixed receiver


  1. Navigate to Firefox addons
  2. Click on “Firefox only – Download Firefox now
  3. Follow pop-up instructions
  4. Navigate to about:addons
  5. Locate Sms77 Add-On and click on the 3 horizontal points
  6. Specify the required API key on the page that opens


If you have any questions about the Firefox add-on, we will be happy to answer them via e-mail.