Follow these instructions in order to disable Tor Browser letterboxing only if you understand the implications of doing so and are willing to accept the potential risks:

  1. In the Tor Browser address bar enter the address: about:config
  2. Click the button Accept the Risk and Continue

  3. In the top search field, search for letterboxing
  4. Toggle this option to false for the name privacy.resistFingerprinting.letterboxing

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