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I have OSX 10.10.4 and I am using Firefox 39.0 Why is the framerate so slow when I stream video?

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I have noticed that when I stream video on both Vimeo.com and YouTube as well as other sites, the framerate is greatly reduced compared to when I stream video using Safari. I know it's not a hardware issue with my computer. Is there some problem with a plugin in Firefox. I enjoy Firefox because it's the fastest browser I have, I like the design, and it's very easy to customize. But I use Safari more often because of the video stream is very choppy. How could I possibly resolve this issue?

I have noticed that when I stream video on both Vimeo.com and YouTube as well as other sites, the framerate is greatly reduced compared to when I stream video using Safari. I know it's not a hardware issue with my computer. Is there some problem with a plugin in Firefox. I enjoy Firefox because it's the fastest browser I have, I like the design, and it's very easy to customize. But I use Safari more often because of the video stream is very choppy. How could I possibly resolve this issue?

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Hi mbsurfer70, I understand that you are seeing a drop in frame rate when you view videos on vimeo.com.

I do not have any issues with the quality, but there is an option to turn off the HD, but this might not be ideal.

First try these troubleshooting steps: