Firefox developer version crashes the moment I try to open it. I faced similar issue with other (stable) firefox too websense was blocking it, so to over come I added a .dll file named qipcap and it started working fine. But this doesn't help with Developer edition. Crash Report : AdapterDeviceID: 0x1616 AdapterDriverVersion: 20.19.15.4285 AdapterSubsysID: 062b1028 AdapterVendorID: 0x8086 Add-ons: %7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D:51.0a2,e10srollout%40mozilla.org:1.3,firefox%40getpocket.com:1.0.5,flyweb%40mozilla.org:1.0.0,formautofill%40mozilla.org:1.0,webcompat%40mozilla.org:1.0 AddonsShouldHaveBlockedE10s: 0 AvailablePageFile: 25733529600 AvailablePhysicalMemory: 8686051328 AvailableVirtualMemory: 3916267520 BIOS_Manufacturer: Dell Inc. BlockedDllList: BreakpadReserveAddress: 51249152 BreakpadReserveSize: 67108864 BuildID: 20161002004009 ContentSandboxCapable: 1 ContentSandboxLevel: 1 CrashTime: 1475480709 DOMIPCEnabled: 1 E10SCohort: unsupportedChannel EMCheckCompatibility: true Email: FramePoisonBase: 00000000f0de0000 FramePoisonSize: 65536 InstallTime: 1475480313 Notes: AdapterVendorID: 0x8086, AdapterDeviceID: 0x1616, AdapterSubsysID: 062b1028, AdapterDriverVersion: 20.19.15.4285 FP(D00-L1000-W00001000-T0000) D2D1.1? DWrite? DWrite+ D2D1.1+ ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} ProductName: Firefox ReleaseChannel: aurora SafeMode: 0 SecondsSinceLastCrash: 65 StartupCrash: 0 StartupTime: 1475480706 SystemMemoryUsePercentage: 49 TelemetryEnvironment: 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