When I play a YouTube video on my computer, it seems to play fine, but the whole video is black. This happens only when I play the video in Firefox.
I'm using Windows 8.1
What I did so far:
- Restarting Firefox
- Reloading the page with Ctrl+F5
- Seeking back and forth in a video
- Playing different videos, with and without playlist
- Cleaning the cache, cookies, history and everything else…
- Updating Firefox to the latest version
- Disabling all extensions
- Deactivating all plugins
- Opening the video in a private window
Still the same…
I don't want to restart my PC or uninstall and reinstall Firefox, there must be a way around that.
And before I forget:
- The video ads are black too.
- HTML5 videos on other websites work fine.
- I can see all the thumbnails of the video when moving the mouse over the seek bar.
- The videos are not opening in Flash player through the browser – they are the HTML5 versions
Best Answer
The Mozilla support forum has an entry for this problem and it relates to the browser using hardware acceleration causing the problem.
Source: https://support.mozilla.org/en-US/questions/1044374
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untickUse hardware acceleration when available
If you disable hardware acceleration it will fix the problem but it may cause problems elsewhere with, for example, WebGL and other browser graphics technologies.