Crash signatures ^{( what's this? )}: NPFFAddOn.dll@0x11867, NPFFAddOn.dll@0xceb8, NPFFAddOn.dll@0x11657, PFFAddOn.dll@0xe707, NPFFAddOn.dll@0xe590, woutput_l
Crashes with any of the above signatures are a result of your computer containing malicious software.

The most common cause of this problem is Adware.DoubleD. For steps to resolve problems with Firefox and malware, see Is my Firefox problem a result of malware.

To prevent problems like this, do not download toolbars, screen savers, or applications from websites you aren't familiar with.

For troubleshooting other types of Firefox crashes, see Firefox crashes.