Firefox 36x is very slow on Yahoo Beta Mail. Sometimes unresponsive

Hello All,
Firefox 36x in unresponsive when logged onto the New beta of Yahoo mail. It hangs up when scrolling through the in box or when attempting to view new mail.
The normal version of Yahoo mail works great when using
Internet Explorer 8.x.
I have uninstalled most of the add-on's but so far the browser is slow to completely unresponsive. In addition, when visiting select web sites the browser also runs slow.
Dennis C. Cooney, USN Retired, Vietnam Veteran, three tours

(Changing cache size does not resolve this for me.)
To me, the problem appears to be specific for Windows 7, 64-bit? I do not have the problem on my old Windows XP (tested again today).

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