It is a startup crash and apparently with no Firefox extensions in use. Previous similar reports from others may have been associated with third party software. Please test in Windows own safemode. Use the F8 key at when rebooting the computer. If that does not help then try a clean reinstall of Firefox . if you have other recent crash IDs thesubmittedones begining '''bp-''' please paste two or three into your reply. ------ For forum cross referencing purposes * Report for your CrashID : bp-5d29fcc0-763a-4721-ae7d-743692150301 * Crash Signature: __RtlUserThreadStart | _RtlUserThreadStart * Reltaed bugs (old): Bug663446