Slow start up and not responding Firefox 3.6.13

Slow start up and not responding when I open Firefox 3.6.13. As long as 1 minute. I tried in save mode and it doesn't seem to happen. I used McAfee before and now use Norton IS with Real Time Malwarebytes. Still the same speed opening up, so the virus software is not causing the problem I think. I disable a lot of the add-on and still the same problem. Any suggestions?
Vista OS

If other softwares runs fast and smooth it's obvious that it's a Firefox-problem.
Probably because of a corrupt profile.
I have done a "checklist" you could follow here: https://support.mozilla.com/en-US/questions/667207#answer-124643
Regarding slow start up, it's a common and old problem.
Not all FF-users experience it as a problem, but I used to belong to them who suffered.
If your cold start up (the first start after a Windows boot) is really slow, but a warm start (the second time you restart Firefox) is much faster - then I think I can help you.
Try my own simple solution here: https://support.mozilla.com/en-US/questions/762446#answer-119951
I run on Win 7 64-bit and on Firefox 4.0 betas, but that doesn't matter as it works also on older Windows and Firefox versions.
Regarding your anti-virus software. I have tried the most of them. The best tradeoff is in my opinion Eset Smart Security (NOD32).
If you want to try it: http://www.eset.com/download/free-trial/international
I hope this will help you :)

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