AMO:Users/Software Updates

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This page describes the method that Toolkit applications will handle addons and their updates. For the purposes of examples, Firefox will be used. Addons currently supported are themes and extensions.


  • Support for silent or explicit downloading
  • Support for cryptographic signatures
  • Minimize impact on backend build and distribution processes
  • Allow users to easily view and control the process

Downloading the Update

Firefox will periodically check the update servers ( aka AMO) for available updates. The update server will return a manifest file (which is a simple XML file) over HTTPS that will point Firefox at the right update package to download. A separate check is made for each addon.

Processing the Update