Yesterday, I accidentally pressed Ctrl and another key which I do not remember anymore. This triggered my Tor Browser to look like this:

enter image description here

How can I get rid of this grey bar at the bottom?

  • go into about:config and disable privacy.resistFingerprinting.letterboxing or similar.
    – lyiriyah
    Jun 23, 2020 at 12:09

3 Answers 3


This looks like Tor Browser's letterboxing feature: https://support.torproject.org/tbb/maximized-torbrowser-window/

This probably happened when you resized the window. If you make the window slightly taller, the webpage should fill in the bottom section.

  • Well, the thing is that I know what these bars are for but every time I restart the Tor Browser, the window size gets set back to its original size. Before the incident, there has never been a grey bar at the bottom. So, what happened?
    – Nemgathos
    Jun 7, 2020 at 21:20
  • Did you always have the menu bar and bookmark bar enabled? These aren't enabled by default in the Tor Browser. If you disable them, I'm guessing that the grey border will disappear at the normal window size.
    – Steve
    Jun 7, 2020 at 21:27
  • Yes. But even with these things activated, the big grey bar at the bottom did not occur in the past.
    – Nemgathos
    Jun 7, 2020 at 21:29

**** I solved this problem earlier, if it can help another person I would be happy ** menu.customized, deactivate the title bar (bottom right) **


This seems like the letterboxing feature which is used to avoid fingerprinting. Try going to about:config, and turn privacy.resistFingerprinting.letterboxing to false to get rid of it.

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