# Will Fullscreening a Video Affect My Privacy?

**URL:** https://discuss.privacyguides.net/t/will-fullscreening-a-video-affect-my-privacy/24852
**Category:** Questions
**Tags:** browsers
**Created:** 2025-02-11T05:44:38Z
**Posts:** 4

## Post 1 by @Halcyon — 2025-02-11T05:44:38Z

I know that Firefox has a Letterboxing feature to prevent window size-based fingerprinting, but I would like to know if situations like playing a video in fullscreen mode bypass the Letterboxing protection and compromise privacy.

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## Post 2 by @anon36940904 — 2025-02-11T05:53:27Z

What is the compromise you think it may cause?

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## Post 3 by @micdan — 2025-02-11T06:05:16Z

I think it’s asking if the [letterboxing](https://www.zdnet.com/article/firefox-to-add-tor-browser-anti-fingerprinting-technique-called-letterboxing/) feature gets _disabled_ if media it’s fullscreen and _break_ window size-based anti-fingerprinting.

According to the article I linked above:

> Firefox’s letterboxing support doesn’t only work when resizing a browser window but also works when users are maximizing the browser window, or entering in fullscreen mode.

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## Post 4 by @jonah — 2025-02-11T06:18:31Z

They stay on when using the browser in full screen mode. I don’t remember if they’re disabled when watching full screen _media_, but even if it is bypassed it is not a huge privacy concern (unless you have a super weirdly unique monitor). Letterboxing is meant to make unique browser _window_ sizes less identifiable, because you could easily resize the window to a random rectangle size nobody else is using. You can’t do that in full screen anyways.

If you’re watching a full screen video you’re blending in with everyone else watching a full screen video, which is plenty of people.