I just bought a new MacBook Pro with Retina display and I went to youtube.com in Safari to play a video, but the videos required Adobe Flash.

I downloaded Flash Player and installed it, but the videos still don't work. What can I do?

  • 2
    What does "don't work" mean? Do you use any Safari extensions, ad/flash blockers or similar? Did you try with different browsers, e.g. Chrome or Firefox? Can you add (a link to) a screenshot of your browser with YouTube open?
    – nohillside
    Dec 14, 2013 at 12:15

1 Answer 1


You need to remove Youtube's HTML5 trial in order for the flash player to work and remember your preferences.

First join the trial, and then leave it. Leaving the trial is the only way to force YouTube to remember you want the videos played in Flash, but of course to do that you have to join the trial first. It fixed the issue for me.

Here's the link:


If all else fails, try using other browsers (Google Chrome, Mozilla Firefox etc.)

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .