Firefox 21.0 will be temporarily blocked, and then return to normal. Why?

I have a HP Pavilion dv7 series laptop PC with an AMD A8 APU, 750 Gb HD, 16 GB of Ram. I am running Ubuntu 12.04 64-bit (also Windows 7 Home Premium 64-bit). While on Ubuntu, I use 21.0 Firefox and chrome.
My problem is that Firefox without warning will drop the computer screen and locking all the system, the computer does not meet all rendering commands. This state of 'Blocking' last as long as 60 seconds or more. There is NO error message! However, after a period of unpredictable, the computer suddenly will return to life as if nothing had happened AND executes each command mouse that was created during the period of 'Blocking'
Most of the time (but), this condition of 'Blocking' begins when I try to watch a video on the Internet. Again, this condition of 'Blocking' is completely unpredictable and will last for various periods of time unknown. I won't know this situation when using chrome.
This is not the end of the world, but it can be extremely frustrating... enough to stop using Mozilla Firefox. Y at - it an explanation for this problem? Y at - it a setting I can adjust for this problem? I always update any software that is offered by Ubuntu. I think I'm reasonably current in all Ubuntu Software. Please help me. Thank you.

Thank you for your response. I've not yet disabled the "hardware acceleration".
To date, Firefox has been irratic and unpredictable. Sometimes Firefox will play perfectly... quickly with no video display problems or any other part of the Internet. Then, without warning the screen will become dim and lock from my computer.
Finally, I have received an error message about a busy Script or does not respond. What follows is a description of what appeared on my computer screen:
Script: resource://gre/components/nsUrlClassifierLib.js:1277

I'm not a programmer, but it seems that Firefox has a problem with a library file.
July 3, 2013, Ubuntu has suggested that I have download an upgrade for chrome and Firefox. I believe (not sure though) that download video drivers. After completing the download, Firefox was preforming big... FAST without any problems with any aspect of the Internet... even videos. Then, on July 5, 2013, Ubuntu has suggested that I have download an upgrade for some library files. At the end of this upgrade. I noticed the same problem of the screen from dimming and locking the computer.

I hope that this new Error Message information may provide a clue for a genius programmer to help solve this problem. Again, thank you for your help.

Tags: Firefox

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