Firefox Bogged Down, Tried many things with no luck

Firefox 32.0.3 very slow will not play certain videos or display certain graphs, images. Would appreciate some help please as I want a reliable machine. I am posting this on my backup machine.
Was running nightly. Uninstalled it using Revo Uninstaller Advanced when the slowness started.
Installed firefox as above with same problems.
Tried Reset, Tried basic profile with no add ons. Profile improved so that some use could be made but still slow.
e.g. www.finance.yahoo.com will not play videos from this site. Just freezes and eventually comes up with unresponsive script.
Similar on www.google.com/finance - unresponsive script when trying to display images.
www.speakeasy.net/speedtest will not display. (uses Java).
Installed Java 67 and uninstalled old versions.
IE11 runs these sites OK.
Updated Adobe Shockwave and test passed.
Updated Adobe Flash player.
Hitman Pro finds no threats.
Running Windows Security Essentials.
Win7 professional 64-bit SP1 genuine regular updates.
HP8100 desktop computer with Intel i5 [email protected]
4GB dual channel DDR@665MHz
HP304Ah motherboard, (XUI Processor)
Hard disk, 232GB with 13GB space.
Computer has 70 processes running.
Have another lower spec desktop running Win8.1 and a i3 laptop that both run these sites OK - one with Nightly and the other with Firefox.
When the system was working with Nightly the system did not bog down until I had over 30tabs open in Firefox. Nows its bogged down with only 2 tabs open.

Create a new profile as a test to check if your current profile is causing the problem.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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