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: {"build":{"applicationId":"{ec8030f7-c20a-464f-9b0e-13a3a9e97384}","applicationName":"Firefox","architecture":"x86","buildId":"20161002004009","version":"51.0a2","vendor":"Mozilla","platformVersion":"51.0a2","xpcomAbi":"x86-msvc","hotfixVersion":null},"partner":{"distributionId":null,"distributionVersion":null,"partnerId":null,"distributor":null,"distributorChannel":null,"partnerNames":[]},"system":{"memoryMB":16275,"virtualMaxMB":4096,"cpu":{"count":4,"cores":2,"vendor":"GenuineIntel","family":6,"model":61,"stepping":4,"l2cacheKB":256,"l3cacheKB":4096,"speedMHz":2594,"extensions":["hasMMX","hasSSE","hasSSE2","hasSSE3","hasSSSE3","hasSSE4_1","hasSSE4_2","hasAVX","hasAVX2"]},"os":{"name":"Windows_NT","version":"6.3","locale":"en-US","servicePackMajor":0,"servicePackMinor":0,"installYear":2015},"hdd":{"profile":{"model":"SAMSUNG SSD PM851 2.5 7mm 512GB","revision":"EXT07D0Q"},"binary":{"model":"SAMSUNG SSD PM851 2.5 7mm 512GB","revision":"EXT07D0Q"},"system":{"model":"SAMSUNG SSD PM851 2.5 7mm 512GB","revision":"EXT07D0Q"}},"gfx":{"D2DEnabled":false,"DWriteEnabled":true,"ContentBackend":"Direct2D 1.1","adapters":[{"description":"Intel(R) HD Graphics 5500","vendorID":"0x8086","deviceID":"0x1616","subsysID":"062b1028","RAM":null,"driver":"igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32","driverVersion":"20.19.15.4285","driverDate":"9-11-2015","GPUActive":true}],"monitors":[{"screenWidth":1366,"screenHeight":768,"refreshRate":60,"pseudoDisplay":false}],"features":{"compositor":"none","d3d11":{"status":"available","version":45312,"warp":false,"textureSharing":true,"blacklisted":false},"d2d":{"status":"available","version":"1.1"}}},"isWow64":true},"settings":{"blocklistEnabled":true,"e10sEnabled":true,"e10sCohort":"unsupportedChannel","telemetryEnabled":true,"locale":"en-US","update":{"channel":"aurora","enabled":true,"autoDownload":true},"userPrefs":{"browser.newtabpage.enhanced":true},"addonCompatibilityCheckEnabled":true,"isDefaultBrowser":false},"profile":{"creationDate":17077},"addons":{"activeAddons":{"e10srollout@mozilla.org":{"blocklisted":false,"description":"Staged rollout of Firefox multi-process feature.","name":"Multi-process staged rollout","userDisabled":false,"appDisabled":false,"version":"1.3","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":17076,"updateDay":17076,"isSystem":true},"firefox@getpocket.com":{"blocklisted":false,"description":"When you find something you want to view later, put it in Pocket.","name":"Pocket","userDisabled":false,"appDisabled":false,"version":"1.0.5","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":17076,"updateDay":17076,"isSystem":true},"flyweb@mozilla.org":{"blocklisted":false,"description":"Discover nearby services in the browser","name":"FlyWeb","userDisabled":false,"appDisabled":false,"version":"1.0.0","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":17076,"updateDay":17076,"isSystem":true},"formautofill@mozilla.org":{"blocklisted":false,"description":"Autofill forms with saved profiles","name":"Form Autofill","userDisabled":false,"appDisabled":false,"version":"1.0","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":17076,"updateDay":17076,"isSystem":true},"webcompat@mozilla.org":{"blocklisted":false,"description":"Urgent post-release fixes for web compatibility.","name":"Web Compat","userDisabled":false,"appDisabled":false,"version":"1.0","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":17076,"updateDay":17076,"isSystem":true}},"theme":{"id":"{972ce4c6-7e08-4474-a285-3208198ce6fd}","blocklisted":false,"description":"The default theme.","name":"Default","userDisabled":false,"appDisabled":false,"version":"51.0a2","scope":4,"foreignInstall":false,"hasBinaryComponents":false,"installDay":17076,"updateDay":17076},"activePlugins":[{"name":"Adobe Acrobat","version":"15.17.20050.61080","description":"Adobe PDF Plug-In For Firefox and Netscape 15.17.20050","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/pdf","application/vnd.adobe.pdfxml","application/vnd.adobe.x-mars","application/vnd.fdf","application/vnd.adobe.xfdf","application/vnd.adobe.xdp+xml","application/vnd.adobe.xfd+xml"],"updateDay":16982},{"name":"VLC Web Plugin","version":"2.2.4.0","description":"VLC media player Web Plugin","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["audio/mp1","audio/mp2","audio/mp3","audio/mpeg","audio/mpg","audio/x-mp1","audio/x-mp2","audio/x-mp3","audio/x-mpeg","audio/x-mpg","video/mpeg","video/x-mpeg","video/mp2t","video/mpeg-system","video/x-mpeg-system","video/x-mpeg2","audio/aac","audio/x-aac","audio/mp4","audio/x-m4a","audio/m4a","video/mp4","application/mpeg4-iod","application/mpeg4-muxcodetable","application/x-extension-m4a","application/x-extension-mp4","video/x-m4v","video/mp4v-es","audio/x-pn-windows-acm","video/divx","video/msvideo","video/vnd.divx","video/x-avi","video/x-msvideo","application/ogg","video/ogg","audio/ogg","application/x-ogg","video/x-ogm+ogg","video/x-theora+ogg","video/x-theora","audio/x-vorbis+ogg","audio/x-vorbis","audio/x-speex","audio/ogg;codecs=opus","audio/opus","application/x-vlc-plugin","audio/x-ms-asf","audio/x-ms-asx","audio/x-ms-wax","video/x-ms-asf","video/x-ms-asf-plugin","video/x-ms-asx","video/x-ms-asf-plugin","video/x-ms-asf","application/x-mplayer2","video/x-ms-wm","video/x-ms-wmv","video/x-ms-wmx","video/x-ms-wvx","audio/x-ms-wma","application/x-google-vlc-plugin","audio/wav","audio/x-wav","audio/x-pn-wav","audio/x-pn-au","video/3gp","audio/3gpp","video/3gpp","audio/3gpp2","video/3gpp2","video/fli","video/flv","video/x-flc","video/x-fli","video/x-flv","application/x-matroska","video/x-matroska","audio/x-matroska","application/xspf+xml","audio/mpegurl","audio/x-mpegurl","audio/scpls","audio/x-scpls","text/google-video-pointer","text/x-google-video-pointer","video/vnd.mpegurl","application/vnd.apple.mpegurl","application/vnd.ms-asf","application/vnd.ms-wpl","application/sdp","audio/dv","video/dv","audio/x-aiff","audio/x-pn-aiff","video/x-anim","video/webm","audio/webm","application/ram","application/vnd.rn-realmedia-vbr","application/vnd.rn-realmedia","audio/vnd.rn-realaudio","audio/x-pn-realaudio-plugin","audio/x-pn-realaudio","audio/x-real-audio","audio/x-realaudio","video/vnd.rn-realvideo","audio/amr-wb","audio/amr","audio/amr-wb","audio/amr","application/x-flac","audio/x-flac","audio/flac","application/x-flash-video","application/x-shockwave-flash","audio/ac3","audio/eac3","audio/basic","audio/midi","audio/vnd.dts.hd","audio/vnd.dolby.heaac.1","audio/vnd.dolby.heaac.2","audio/vnd.dolby.mlp","audio/vnd.dts","audio/x-ape","audio/x-gsm","audio/x-musepack","audio/x-shorten","audio/x-tta","audio/x-wavpack","audio/x-it","audio/x-mod","audio/x-s3m","audio/x-xm","application/mxf","image/vnd.rn-realpix","misc/ultravox","video/x-nsv"],"updateDay":16953},{"name":"Google Update","version":"1.3.31.5","description":"Google Update","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/x-vnd.google.update3webcontrol.3","application/x-vnd.google.oneclickctrl.9"],"updateDay":17011},{"name":"Microsoft Office 2016","version":"16.0.6925.1038","description":"The plugin allows you to have a better experience with Microsoft SharePoint","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/x-sharepoint","application/x-sharepoint-uc"],"updateDay":17048},{"name":"Silverlight Plug-In","version":"5.1.50428.0","description":"5.1.50428.0","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/x-silverlight","application/x-silverlight-2"],"updateDay":16918},{"name":"Microsoft Office 2016","version":"16.0.6925.1038","description":"The plugin allows you to have a better experience with Microsoft Lync","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/vnd.microsoft.communicator.ocsmeeting"],"updateDay":17048},{"name":"Java(TM) Platform SE 8 U101","version":"11.101.2.13","description":"Next Generation Java Plug-in 11.101.2 for Mozilla browsers","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/x-java-applet","application/x-java-bean","application/x-java-vm","application/x-java-applet;version=1.1.1","appl