Why does Firefox 8.0 open so SLOW?

I just updated to Firefox 8.0. I had the same problem before updating from 7.0. It takes over 1 minute for firefox to open on my home computer which runs Windows 7. However, my office computer runs XP and opens Firefox 7.0 in less than 10 seconds. Home computer opened fast when firefox was first installed when purchased new 6 mo ago. Firefox was originally installed on both computer at approx. same time. Why does it open so SLOW? I've search several websites for solution, but most posts were several years old. I'm ready to go back to Internet Explorer. 60 seconds is a long time to hold your breathe.

Hope this helps a bit
https://support.mozilla.com/en-US/kb/firefox-takes-long-time-start-up?s=slow&r=1&as=s#os=mac&browser=fx8

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