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FF freezes my whole computer when watching videos. What to do?!

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Hi there. So, for quite a while now, Firefox keeps on freezing my whole computer while watching videos on YouTube or streams on Twitch. It started a few weeks back & when I couldn't resolve the problem, I changed to Chrome. But I just don't like it, so yesterday, I decided to go back to my fav browser: Firefox.

But my problem remains: When I'm watching a video, my browser constantly keeps freezing my whole MacBook. It starts with the video just stopping but the audio keeps going on for some 10-20 seconds. Then I can't move the cursor anymore & finally the sound dies & nothing reacts anymore. I can't even open the Activity Monitor or do anything else. So the only possibility for me to get back doing stuff is to hard reset my laptop & boot it again. This just happened to me twice in the last two & 4 or 5 times in the last 24 hours... I would really appreciate, if anyone could point me towards an solution.

Oh, and I'm on OS X 10.10.2 using Firefox 36.0.1 (but it also happened on 35.x before). Hardware Acceleration is turned off & flash is on its latest version. Cache has been flushed several times as well.

Isisombululo esikhethiwe

Crashes or other problems with certain multimedia content in Firefox (such as YouTube videos and Flash animations or games) can often be resolved by performing the steps in these Knowledge Base articles:

Please tell us if this helped!

Funda le mpendulo ngokuhambisana nalesi sihloko 👍 1

All Replies (4)

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Isisombululo Esikhethiwe

Crashes or other problems with certain multimedia content in Firefox (such as YouTube videos and Flash animations or games) can often be resolved by performing the steps in these Knowledge Base articles:

Please tell us if this helped!

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kushagra said

Crashes or other problems with certain multimedia content in Firefox (such as YouTube videos and Flash animations or games) can often be resolved by performing the steps in these Knowledge Base articles: Please tell us if this helped! you may also refer for more help here: https://support.mozilla.org/en-US/kb/keep-flash-up-to-date-and-troubleshoot-problems#w_playing-flash-videos-makes-firefox-hang
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kushagra said

Crashes or other problems with certain multimedia content in Firefox (such as YouTube videos and Flash animations or games) can often be resolved by performing the steps in these Knowledge Base articles: Please tell us if this helped!

So it seems like disabling Flash's own Hardware Acceleration (which I didn't even know was a thing) solved my problem. At least there were no more crashes so far.

Thanks a lot!

Okulungisiwe ngu EddyTheGr8

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I have the same problem. But only since yesterday when I updated to FF39 and updated Flash at the same time.

I am using Windows 7 and had no problem like this using FF19 and FF38.

I don't have to reboot, just close a restart FF which is slightly annoying if I'm on a site which has a 'view new content since last vist' as the last visit was only 3 seconds before.

I have disabled Flash Hardware Acceleration to no effect.