Why does Mozilla Firefox hang (Freeze) on startup?

For the last few version of the Firefox browser I have noticed it hangs on start up for approximately thirteen to twenty five seconds. Upon reinstalling it seems to work fine but when I reinstall my old profile it begins again. Obviously something in my profile is causing this but I have deleted my cache, uninstalled applications or add-on's, etc. Is there something I am forgetting to check?

* Try this.
* Type in the address bar about:config.
* Accept the warning.
* In the page that appears, in the Filter box, type network.http.max-connections.
* Change the value to 32 (which is probably set to 256 in your case).
* Close the about:config page.
* Restart the browser.

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