Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

搜尋 Mozilla 技術支援網站

防止技術支援詐騙。我們絕對不會要求您撥打電話或發送簡訊,或是提供個人資訊。請用「回報濫用」功能回報可疑的行為。

Learn More

Can't play 1440p or 4K video on YouTube

  • 1 回覆
  • 8 有這個問題
  • 9 次檢視
  • 最近回覆由 imrazor

more options

For some reason, Firefox won't allow me to select any resolution over 1080p even for videos that are explicitly denoted as 4K. Chrome will allow me to play these videos at 1440p or 4K, but Firefox maxes out at 1080p. I have a 30" 1600p monitor and I'd like to use the full capabilities of my monitor without having to resort to Chrome.

For some reason, Firefox won't allow me to select any resolution over 1080p even for videos that are explicitly denoted as 4K. Chrome will allow me to play these videos at 1440p or 4K, but Firefox maxes out at 1080p. I have a 30" 1600p monitor and I'd like to use the full capabilities of my monitor without having to resort to Chrome.

所有回覆 (1)

more options

So here's an interesting twist. I tried Firefox in a Windows 8.1 Pro x64 virtual machine, and it was able to play 1440p video with no issues. Is this a Windows 7 issue?