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Whenever I click "full screen" on YouTube, it changes the "quality settings" from 240p to 480p. I prefer to control the quality setting myself, and not have it influenced by the full screen button.

Is there a way to stop this? A Greasemonkey script perhaps?

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up vote 5 down vote accepted

Officially you can't and there are a lot of requests for that in Google Forums.

One of the Google Employees says:

There are a few different options if you login, then choose "settings" in the drop down where you select quality (right under the video player):

  • I have a slow connection. Never play higher-quality video.
  • Always choose the best option for me based on my player size.
  • Always play HD when switching to fullscreen (when available)

You can try one of the scripts to find the one that suits you best.

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Too bad that option does not work (nor ever has). It think it’s a placebo button. Stupid Google. – Synetech Dec 24 '15 at 4:24

Try these Firefox add-ons:

  1. YouTube quality manager

  2. Smartvideo for YouTube

Both can be a bit buggy though.

Alternatively, you can just click the settings icon on the YouTube video itself and choose the video quality you want before you hit the fullscreen button for every video you watch.

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