hello, could you go to the firefox menu ≡ > help ? > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum? this might give us a clue what is going on...

Application Basics Name Firefox Version 46.0 Build ID 20160421124000 Update History Update Channel release User Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0 Profile Folder Enabled Plugins about:plugins Build Configuration about:buildconfig Memory Use about:memory Registered Service Workers about:serviceworkers Multiprocess Windows 0/1 (Disabled) Safe Mode false Profiles about:profiles Crash Reports for the Last 3 Days Report ID Submitted

All Crash Reports Extensions Name Version Enabled ID Firefox Hello 1.2.6 true loop@mozilla.org Multi-process staged rollout 1.0 true e10srollout@mozilla.org Pocket 1.0 true firefox@getpocket.com BullGuard Safe Browsing 2.1 false antiphishing@bullguard Default Manager 2.2 false {3252b9ae-c69a-4eaf-9502-dc9c1f6c009e} DigitalPersona Extension 5.0.0.4503 false otis@digitalpersona.com Freemake Video Converter Plugin 1.0.0 false fmconverter@gmail.com Search Helper Extension 1.0 false {27182e60-b5f3-411c-b545-b44205977502} Skype 8.0.0.9103 false {82AF8DCA-6DE9-405D-BD5E-43525BDAD38A} Graphics Adapter Description Mobile Intel(R) HD Graphics Adapter Drivers igdumd64 igd10umd64 igd10umd64 igdumdx32 igd10umd32 igd10umd32 Adapter RAM Unknown Asynchronous Pan/Zoom none ClearType Parameters Gamma: 2100 Pixel Structure: B ClearType Level: 100 Enhanced Contrast: 50 Device ID 0x0116 Direct2D Enabled Blocked for your graphics driver version mismatch between registry and DLL. DirectWrite Enabled false (6.2.9200.17568) Driver Date 1-27-2011 Driver Version 8.811.1.4000 GPU #2 Active false GPU Accelerated Windows 0/1 Basic (OMTC) Blocked for your graphics driver version mismatch between registry and DLL. Subsys ID 04cd1028 Supports Hardware H264 Decoding No; Hardware video decoding disabled or blacklisted Vendor ID 0x8086 WebGL Renderer Blocked for your graphics driver version mismatch between registry and DLL. windowLayerManagerRemote true AzureCanvasBackend skia AzureContentBackend cairo AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0 Important Modified Preferences Name Value browser.cache.disk.capacity 358400 browser.cache.disk.filesystem_reported 1 browser.cache.disk.smart_size.first_run false browser.cache.disk.smart_size.use_old_max false browser.cache.frecency_experiment 1 browser.download.importedFromSqlite true browser.places.smartBookmarksVersion 7 browser.sessionstore.upgradeBackup.latestBuildID 20160421124000 browser.startup.homepage http://www.bbc.co.uk/ browser.startup.homepage_override.buildID 20160421124000 browser.startup.homepage_override.mstone 46.0 dom.apps.reset-permissions true dom.mozApps.used true extensions.lastAppVersion 46.0 gfx.crash-guard.d3d11layers.appVersion 46.0 gfx.crash-guard.d3d11layers.deviceID 0x0116 gfx.crash-guard.d3d11layers.driverVersion 8.811.1.4000 gfx.crash-guard.d3d11layers.feature-d2d false gfx.crash-guard.d3d11layers.feature-d3d11 false gfx.crash-guard.status.d3d11layers 2 media.gmp-manager.buildID 20160421124000 media.hardware-video-decoding.failed false network.cookie.prefsMigrated true network.predictor.cleaned-up true places.database.lastMaintenance 1461945249 places.history.expiration.transient_current_max_pages 104858 plugin.disable_full_page_plugin_for_types application/pdf plugin.importedState true privacy.sanitize.migrateClearSavedPwdsOnExit true services.sync.declinedEngines storage.vacuum.last.index 0 storage.vacuum.last.places.sqlite 1461945249 Important Locked Preferences Name Value JavaScript Incremental GC true Accessibility Activated false Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.12 4.12 NSS 3.22.3 Basic ECC 3.22.3 Basic ECC NSSSMIME 3.22.3 Basic ECC 3.22.3 Basic ECC NSSSSL 3.22.3 Basic ECC 3.22.3 Basic ECC NSSUTIL 3.22.3 3.22.3 Experimental Features Name ID Description Active End Date Homepage Branch

thanks, in addition could you provide any submitted crash reports? please enter about:crashes into the location bar, copy the latest few report ids from there starting with bp- & paste them here into a forum reply...

bp-5b1870a0-76f0-43de-a61a-183ed2160420 20/04/2016 22:44 0d3c95e1-e571-498b-91d1-c3daa6d2347d 12/04/2016 16:29 f85902e3-def2-444c-a098-beb68f849bf6 12/04/2016 16:13 03c81715-7617-4c95-9622-5aa9dbc013a5 12/04/2016 16:12 386bbb89-8164-43af-8bfe-a837238bb745 12/04/2016 16:12 c211693d-19d0-42e5-975c-adddfb03fb47 12/04/2016 16:11 26f231b7-e12b-4e8c-a152-f5189adab783 12/04/2016 16:11

thank you, mozilla's developers are looking into the issue - i will report back once we have an update for it.

hi again, we have now released an update to firefox 46.0.1 which might hopefully address this issue. you can download and install it from https://www.mozilla.org/en-US/firefox/all/