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Firefox Add-On

The sms77io add-on for Firefox allows you to send SMS to a recipient of your choice.


  1. Navigate to https://addons.mozilla.org/de/firefox/addon/sms77-add-on
  2. Click on “Only in Firefox – Download Firefox now”
  3. Follow pop-up instructions
  4. Navigate to about:addons
  5. Localize Sms77 add-on and click on the 3 horizontal points
  6. Indicate the required API key on the opening page


  • Send SMS
  • Sending marked text from a web page
  • Specify a signature for all outgoing messages
  • Specify a signature position
  • Specify a fixed sender identifier
  • Specify a fixed receiver
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