Load Extension in Fiddler

Updated on Nov 6, 2025
  1. Compile your project.

  2. For Extensions projects, copy the assembly .DLL to the correct Scripts folder:

  • Use %userprofile%\Documents\Fiddler2\Scripts to make the extension available to the current user.
  1. For Custom Inspector projects, copy the assembly .DLL to the correct Inspectors folder:
  • Use %userprofile%\Documents\Fiddler2\Inspectors to make the inspector extension available to the current user.
  1. Restart Fiddler.
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