FireFox 29.0.1 is sluggest to non-responsive

I am running Windows XP plus the two service Packs and have the RAM maxed out. The hard disk has at least 60% space available.
I have several malware bug programs who have reported my system is clean. The hard disk has been defragged. When this version of FF was installed, it accepted all plugins except Forecastfox 2.2.2.
Firefox is slow to respond to a click on a web site using 10 or more seconds to even show in the tab that it is "Connecting." When "Connecting" in a tab appears it then takes much more that 10 seconds before the web page is displayed. When writing this report as well as other writing on some other web page, there is a pause when the space bar is pressed. Trying to go back a page has the same slowness of many seconds.
I'm tired of this. If it is not being fixed, can I roll back to the previous version of FF that worked so well?

Is this with some web pages, many all?<BR><BR>
Many site issues can be caused by corrupt cookies or cache.<BR><BR>
Clear the Cache<BR>
'''''Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"'''''
<BR><BR>and<BR><BR>
Remove Cookies<BR>'''''Firefox/Tools > Options > Privacy.'''''<BR>
Under '''History''', select Firefox will '''Use Custom Settings'''.<BR>
There is a button on the right side called '''Show Cookies'''.<BR><BR>
If there is still a problem,
'''''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]'''''
<BR>While you are in safe mode;<BR>
'''''Firefox Options > Advanced > General'''''.<BR>
Look for and turn off '''Use Hardware Acceleration'''.<BR>
Poke around safe web sites and see if there is still a problem. Then restart.

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