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This article describes why Firefox may close itself unexpectedly when using Yahoo!® Mail. For problems with Firefox crashing when not using Yahoo!® Mail, see Firefox crashes - Troubleshoot, prevent and get help fixing crashes
The Yahoo!® Application State plugin can cause crashes. You'll need to disable this plugin.
- Click the Firefox menu and select .Click the Firefox menu at the top of the screen and select .Click the Firefox menu and select .
- Open My Computer or Windows Explorer.
- Browse to the directory: C:\Program Files\Yahoo!\shared
- Delete the file npYState.dll. Now that this plugin has been removed, Firefox may stop crashing when using Yahoo!® Mail.
Removing the plugin will not affect your ability to use Yahoo! Mail.