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Add-on may refer to:

• Add-on (Mozilla), a software bundle that allows the user to extend and customize Mozilla-based applications.
  • Mozilla Add-ons, the official Mozilla Foundation website that acts as a repository for add-ons for Mozilla-based applications.
• Microsoft Flight Simulator add-ons, third party additions to provide enhancements to Microsoft Flight Simulator.
• Peripherals, sometimes informally referred to as "add-ons".

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