I am using windows 7 64-bit, after updating firefox to v33.1.1, it significantly slows down my computer. It worsens if I use Flash v15 at same time

My CPU usage keep at close to 100% whenever I open firefox with or without flash, of course it is nightmare with both on use together. Don't have this problem with my other computer using windows 8.1. Can you help me solve this problem please? Thanks.

'''[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?
Then restart.

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