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I have a desktop computer with xp Pro windows. I updated from Firefox 3.6 to 4.0 and found I could not connect to the internet using this updated bowser. I had to remove 4.0 and reinstall 3.6 to restore a working version of Mozilla. Why did this occur?

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I tried to update my browser from 3.6 to4.0. On restarting the computer I found I could no longer connect to the internet. I then connected to the internet using Internet Explorer and removed the mozilla browser and reinstall Mozilla firefox 4.0. Again the browser using this updated version didn't work. So reinstalled Mozilla firefox 3.6 and it worked. It appearsMozilla firefox 4.0 has a problem. My operating system is Windows XP pro.

I tried to update my browser from 3.6 to4.0. On restarting the computer I found I could no longer connect to the internet. I then connected to the internet using Internet Explorer and removed the mozilla browser and reinstall Mozilla firefox 4.0. Again the browser using this updated version didn't work. So reinstalled Mozilla firefox 3.6 and it worked. It appearsMozilla firefox 4.0 has a problem. My operating system is Windows XP pro.