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While allowing automatic update program crashed firefox says missing xul.dll

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osbo082
osbo082
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Popup asked to update firefox, allowed it to continue, selected to restart firefox after it installed, firefox will not restart saying missing xul.dll

Popup asked to update firefox, allowed it to continue, selected to restart firefox after it installed, firefox will not restart saying missing xul.dll

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cor-el
cor-el
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Do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.

Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
Don't remove personal data when uninstalling.

It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.

You can skip the step to create a new profile, that is not necessary for this issue.

See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall