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This crash signature indicates that Firefox's crash reporter was not able to gather enough information about the crash. If you have other crash report IDs, try clicking on another one.
Some crashes with this signature may be caused by a virus called "Dummy Windowless". If you suspect this is the case, see the article Troubleshoot Firefox issues caused by malware.
You can also try general troubleshooting steps at Firefox crashes - Troubleshoot, prevent and get help fixing crashes.