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Remove Temporary Attachment Files on Exit on macOS

On macOS, if you open an attachment in a helper application (like Preview, iWorks, etc.), Postbox will not delete that temporary file on exit. If you want the temporary file to be removed on exit, you need to set a hidden pref.

  • Open the config editor.
  • Right click in the Config Editor and from the context menu, choose New | Boolean.
  • Enter a preference name of browser.helperApps.deleteTempFileOnExit and select OK
  • Select true as the value for this preference.

The next time you open an attachment in Postbox, that temporary file will be deleted on exit.