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Updated FFox 8.1 form 6.3 and when I try to start it I get a message: Titled: XUL runner – “Could not load XRE functions”

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  • Last reply by bsandy

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I tried to update FFox from Help at the top of the tool bar. It down loaded and one would normally expect it to update auto install normally but when it finished and closed FFox to restart like usual instead of restarting it gave a message that FFox was running and must be closed first. I could find no instance of FFox running in the status bar or in Task Manager Applications. So I logged off and back on to reset everything in case it was running in the background. I Tried the update from Help again. Same message just when FFox closed and attempted to restart saying FFox was running and must be closed. I used FFox to go to the FF site and read the help and problems section for 8.1 and saw a suggestion to Down load a copy of 8.1 and install it form desk top. So I did this. Before installing 8.1, I un-stalled the old one and rebooted then installed it form the desktop and rebooted. But when I clicked the Icon to start FFox it paused a moment --- I got a message Titled: XUL runner “Couldn’t load XRE functions”.

I tried to update FFox from Help at the top of the tool bar. It down loaded and one would normally expect it to update auto install normally but when it finished and closed FFox to restart like usual instead of restarting it gave a message that FFox was running and must be closed first. I could find no instance of FFox running in the status bar or in Task Manager Applications. So I logged off and back on to reset everything in case it was running in the background. I Tried the update from Help again. Same message just when FFox closed and attempted to restart saying FFox was running and must be closed. I used FFox to go to the FF site and read the help and problems section for 8.1 and saw a suggestion to Down load a copy of 8.1 and install it form desk top. So I did this. Before installing 8.1, I un-stalled the old one and rebooted then installed it form the desktop and rebooted. But when I clicked the Icon to start FFox it paused a moment --- I got a message Titled: XUL runner “Couldn’t load XRE functions”.

Chosen solution

Ok, I solved it. I am running Zone Alarm. I saw in a reply in a Google search elsewhere a gal running Zone had the same problem and when she went in to the firewall settings and turned off the Browser Visualization FF worked.

Worked for me too. So looks like something to take up with Zone.

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Do a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version if possible.

  • Do NOT remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

  • 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.

Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.


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Thank you for trying to help. Unfortunately, I had already done a Full uninstal and Deleted All the Mozilla Firefox folder before my clean install.

And just as unfortunately I am still using IE Explorer to post here and still have the same Title: XUL runner "could not load functions" message box.

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Chosen Solution

Ok, I solved it. I am running Zone Alarm. I saw in a reply in a Google search elsewhere a gal running Zone had the same problem and when she went in to the firewall settings and turned off the Browser Visualization FF worked.

Worked for me too. So looks like something to take up with Zone.