After downloading the updates to Firefox (per alert) I lost 50% cpu

HELP!! I received an alert that I needed to update Firefox on my 8.1 Windows desktop.
Before this happened my NEW HP computer was running great and Firefox was running great.
After downloading Firefox ...everything takes 1-3 minutes to accomplish. To open my mail, to google search... anything that uses a browser is like molasses.
Each time I tell someone this happened their answer is.... "don't use Firefox". That should NOT be the answer.
Please help. All was OK before the Firefox download.
Thank you (Here is the error information...not sure if it helps)
<pre><nowiki>Filename: firefox.exe
Full Path: c:\program files (x86)\mozilla firefox\firefox.exe
Details
Stability Unknown, Many Users, New, Good
Origin Downloaded from Unknown
Activity Actions performed: Actions performed: 1
Developers Mozilla Corporation
Version 29.0.1.5239
Identified 5/10/2014 at 9:35:57 PM
Last Used 5/14/2014 at 8:06:49 AM
Startup Item No
Unknown
This program crash history is not known.
Many Users - Tens of thousands of users in the Norton Community have used this file.
New -This file was released more than 7 days ago.
Good - Norton has given this file a good rating.
Source File: firefox.exe
Performance
Avg. Resource Usage: Heavy
Avg. CPU Usage: Moderate
Avg. Memory Usage: Heavy
Performance Alert
Process ID 2940
CPU 47% of at least one CPU.
Memory Normal
Handles Count Normal
Disk Read Activity Normal
Disk Write Activity Normal
System Change
c:\users\kelly\appdata\local\mozilla\firefox\profiles\mht5vl2p.default\cache\1\eb\a3b34d01
File Thumbprint - SHA:
ee8b03fcbcf8e4ac45a21c7a3fe3b980e56c6e988d4ca91db85c395cae034653
File Thumbprint - MD5:
0da891cb0703d912ceafa072f54d002b</nowiki></pre>

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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After downloading the updates to Firefox (per alert) I lost 50% cpu

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