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See this Microsoft support article for details, including a fix you can download. Firefox may fail to start if the Iolo System Mechanic application is installed. Update all plugins, uninstall any plugins you no longer need or disable all plugins, to see if that resolves the problem.See Issues related to plugins for plugin locations and additional troubleshooting information, including how to disable plugins if your browser will not start.  If you see message, This application has failed to start because js3250was not found.Re-installing the application may fix this problem.If you used "sudo" to install Firefox and it starts at the end of the install process and runs when you log in as root but fails to run as a normal user, then check the ownership of "$HOME/.mozilla" and subdirectories.
  If the problem persists, restart the system or use Task Manager again, then delete the "xpicleanup.exe" file in the Firefox installation directory (usually Firefox may fail to start after updating and you may see the error, The procedure entry point js_Save Reg Exp Statics could not be located in the dynamic link library js3250
The ownership of "$HOME/.mozilla" and subdirectories may be set to "root:root", and you will need to execute or something similar when starting Firefox, then the library is not new enough to support Firefox 1.5 and possibly previous versions.
Updating GLIBC is not advised as other applications depend upon it.
As a workaround, try disabling the two System Mechanic services.
You can also try renaming the "iolo HL.dll" file in the C:\Program Files\iolo\Common\Lib folder.