For a while, my Firefox 2 on Windows XP would crash almost every time I logged out of Yahoo! Mail. Sometimes it would even happen if I just switched from Yahoo! Mail to another tab or closed the tab. The problem appears to be caused by a plugin installed by Yahoo! Instant Messenger (YIM) conflicting with ad blocking, and possibly other, browser addons.
Here’s how to fix it:
- Go to C:Program FilesYahoo!Shared
- Rename the file npYState.dll to npYState.dll.disabled, or move it to another folder. I created a folder called Disabled and put it in there.
- Restart Firefox
See also: Fix Firefox Crash Part 2