Here are two methods (from this site), although neither are ideal:

Does not work for all videos!

Method 1: Go to http://www.youtube.com/html5 and request the HTML5 player.

Works for all videos but is a hassle.

Method 2: Copy the videoID and paste it after v= in the following link http://www.youtube.com/watch_popup?v=&vq=large.

Note: The videoID is the alphanumeric string after v= e.g., for youtube.com/watch?v=KxICWhyO7dI&feature=autoplay, it's KxICWhyO7dI.

Here are two methods (from this site), although neither are ideal:

Does not work for all videos!

Method 1: Go to http://www.youtube.com/html5 and request the HTML5 player.

Works for all videos but is a hassle.

Method 2: Copy the videoID and paste it after v= in the following link

http://www.youtube.com/watch_popup?v=&vq=large

Note: The videoID is the alphanumeric string after v= e.g., for youtube.com/watch?v=KxICWhyO7dI&feature=autoplay, it's KxICWhyO7dI.