Firefox keeps blinking and stalling

I have used firefox for years. I like to keep a lot of tabs open so I don't have to search around.
Firefox keeps blinking and stalling as hour glass pause kicks in every 10-20 seconds. If trying to type it messes up your flow.
Don't know the cause. Suspect repeated ajax calls from some page but don't know which one.
Here's a jing video of the problem:
http://screencast.com/t/5jmTpAT41sf

I see the whole window blanks out. What about the other windows?
What about the screen itself? Was Firefox full screen or less?
If you have problems with current Shockwave Flash plugin versions then check this:
* see if there are updates for your graphics drive drivers
'''https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration'''
* disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
'''https://forums.adobe.com/message/4468493#TemporaryWorkaround'''
* disable hardware acceleration in the Flash plugin
'''https://forums.adobe.com/thread/891337'''
See also:
* '''http://kb.mozillazine.org/Flash#Troubleshooting'''
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Type '''about:preferences#advanced'''<Enter> in the address bar.
Under '''Advanced,''' Select '''General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites. Are there any problems?

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