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Firefox 4.0.1 giving "TypeError: Components.classes[cid] is undefined". How can I fix this? Other posts on this issue have not solved my problem.

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  • Trả lời mới nhất được viết bởi cor-el

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I've started Firefox in Safe Mode with no addons, extensions, or themes enabled. And it still happens. I've noticed Greasemonkey is installed but can find no way to remove it - but no scripts are installed in it.

I am running AVG antivirus and have read the web-protection component could be causing this problem but have not read how to correct it. Any info would be greatly appreciated.

Happens every time I open Firefox for the first times and every time I open a new browser window. Also happens anytime a web page spawns a popup window. Does NOT happen when I just open a new tab or a link into a new tab.

Giải pháp được chọn

Do a clean (re-)install:

  • Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
  • Do not remove personal data if you uninstall the current version.
  • 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.
  • It may not be necessary to create a new profile, so first try if it works with your current profile and if not then create a new profile.

Create a new profile as a test to check if your current profile is causing the problems. See:

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins"
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)

See:

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Giải pháp được chọn

Do a clean (re-)install:

  • Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
  • Do not remove personal data if you uninstall the current version.
  • 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.
  • It may not be necessary to create a new profile, so first try if it works with your current profile and if not then create a new profile.

Create a new profile as a test to check if your current profile is causing the problems. See:

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins"
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)

See:

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Didn't actually have to do the uninstall/reinstall. Just created a new profile and transferred bookmarks/passwords. I notice now that Greasemonkey no longer shows up. And no more error messages for new windows.

I also reactivated all of AVG antivirus's online scanning tools and everything is still fine.

Thanks for the tip!

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how do you create a new profile?

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See my above post [*]

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I solved this problem by deleting the file "{35379F86-8CCB-4724-AE33-4278DE266C70}" on the "extension" folder located at the backup folder of the history and bookmarks of mozilla.