When I click on the icon, Firefox will open for a brief second and then immediately close and show the Mozilla Crash Reporter window. I tried uninstalling and doing clean reinstalls a few times, as well as cleaning up the registry with CCleaner prior to a new install. I also tried Safe Mode and refreshing Firefox; both of those still result in Firefox immediately crashing upon start. Crash ID: bp-69f1dc8b-8588-4d43-ba69-7a2910170712 I'm unable to automatically add troubleshooting information, and can't add it manually because Firefox crashes before I can access its help menu. With the Windows Event Viewer, I see the following Faulting application name: firefox.exe, version: 54.0.0.6368, time stamp: 0x59399e7c Faulting module name: xul.dll, version: 54.0.0.6368, time stamp: 0x5939a290 Exception code: 0x80000003 Fault offset: 0x007969bc Faulting process id: 0x24ac Faulting application start time: 0x01d2fb1e180c187a Faulting application path: C:\Program Files (x86)\Mozilla Firefox\firefox.exe Faulting module path: C:\Program Files (x86)\Mozilla Firefox\xul.dll Report Id: bf4bbed4-3327-4c12-92f0-5c9f853b715a Faulting package full name: Faulting package-relative application ID: Thanks in advance!!