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: 49.0.2 Build ID: 20161019084923 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 OS: Windows_NT 10.0 Multiprocess Windows: 1/1 (Enabled by default) Safe Mode: false

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Name: Adblock Plus Version: 2.8.1 Enabled: true ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Add-on Compatibility Reporter Version: 2.2.2 Enabled: true ID: compatibility@addons.mozilla.org

Name: Asynchronous Plugin Rendering Version: 2.0 Enabled: true ID: asyncrendering@mozilla.org

Name: Multi-process staged rollout Version: 1.3 Enabled: true ID: e10srollout@mozilla.org

Name: Pocket Version: 1.0.4 Enabled: true ID: firefox@getpocket.com

Name: Web Compat Version: 1.0 Enabled: true ID: webcompat@mozilla.org

Name: McAfee ScriptScan for Firefox Version: 15.4.0 Enabled: false ID: {D19CA586-DD6C-4a0a-96F8-14644F340D60}

Name: WebEx Productivity Tools Version: 2.0 Enabled: false ID: ocplugin@webex.com

Graphics

Features Compositing: Direct3D 11 Asynchronous Pan/Zoom: wheel input enabled WebGL Renderer: Google Inc. -- ANGLE (NVIDIA Quadro M1000M Direct3D11 vs_5_0 ps_5_0) Hardware H264 Decoding: Yes; Using D3D11 API Direct2D: true DirectWrite: true (10.0.10586.0) GPU #1 Active: Yes Description: NVIDIA Quadro M1000M Vendor ID: 0x10de Device ID: 0x13b1 Driver Version: 21.21.13.6909 Driver Date: 8-1-2016 Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um,nvwgf2um Subsys ID: 222e17aa RAM: 2048 GPU #2 Active: No Description: Intel(R) HD Graphics 530 Vendor ID: 0x8086 Device ID: 0x191b Driver Version: 20.19.15.4483 Driver Date: 7-1-2016 Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Subsys ID: 222e17aa RAM: Unknown Diagnostics AzureCanvasAccelerated: 0 AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo Decision Log D3D9_COMPOSITING: disabled by default: Disabled by default

Important Modified Preferences

accessibility.typeaheadfind.flashBar: 0 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: 4 browser.download.folderList: 0 browser.download.importedFromSqlite: true browser.places.smartBookmarksVersion: 8 browser.sessionstore.upgradeBackup.latestBuildID: 20161019084923 browser.startup.homepage: http://wwwin.cisco.com/ browser.startup.homepage_override.buildID: 20161019084923 browser.startup.homepage_override.mstone: 49.0.2 browser.tabs.loadInBackground: false browser.tabs.remote.autostart.2: true browser.tabs.warnOnClose: false browser.urlbar.daysBeforeHidingSuggestionsPrompt: 0 browser.urlbar.lastSuggestionsPromptDate: 20161026 dom.apps.lastUpdate.buildID: 20161019084923 dom.apps.lastUpdate.mstone: 49.0.2 dom.apps.reset-permissions: true dom.push.userAgentID: 727854eef5454699b7760d5f0955852f extensions.lastAppVersion: 49.0.2 font.internaluseonly.changed: true gfx.crash-guard.d3d11layers.appVersion: 49.0.2 gfx.crash-guard.d3d11layers.deviceID: 0x13b1 gfx.crash-guard.d3d11layers.driverVersion: 21.21.13.6909 gfx.crash-guard.d3d11layers.feature-d2d: true gfx.crash-guard.d3d11layers.feature-d3d11: true gfx.crash-guard.status.d3d11layers: 2 gfx.crash-guard.status.d3d11video: 2 gfx.crash-guard.status.d3d9video: 2 media.benchmark.vp9.fps: 181 media.benchmark.vp9.versioncheck: 1 media.gmp-eme-adobe.abi: x86-msvc-x64 media.gmp-eme-adobe.lastUpdate: 1476899434 media.gmp-eme-adobe.version: 17 media.gmp-gmpopenh264.abi: x86-msvc-x64 media.gmp-gmpopenh264.lastUpdate: 1476899435 media.gmp-gmpopenh264.version: 1.6 media.gmp-manager.buildID: 20161019084923 media.gmp-manager.lastCheck: 1478134531 media.gmp-widevinecdm.abi: x86-msvc-x64 media.gmp-widevinecdm.lastUpdate: 1476899436 media.gmp-widevinecdm.version: 1.4.8.903 media.gmp.storage.version.observed: 1 media.hardware-video-decoding.failed: false network.automatic-ntlm-auth.trusted-uris: .cisco.com network.cookie.prefsMigrated: true network.negotiate-auth.delegation-uris: .cisco.com network.negotiate-auth.trusted-uris: .cisco.com network.predictor.cleaned-up: true places.database.lastMaintenance: 1477520851 places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true privacy.donottrackheader.enabled: true security.OCSP.enabled: 0 services.sync.declinedEngines: services.sync.engine.prefs.modified: false services.sync.lastPing: 1478190981 services.sync.lastSync: Thu Nov 03 2016 14:17:31 GMT-0700 (Pacific Standard Time) services.sync.numClients: 2 storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1476899611 ui.osk.debug.keyboardDisplayReason: IKPOS: Touch screen not found.

Important Locked Preferences

Places Database

JavaScript

Incremental GC: true

Accessibility

Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.12 Version in use: 4.12

NSS Expected minimum version: 3.25 Version in use: 3.25

NSSSMIME Expected minimum version: 3.25 Version in use: 3.25

NSSSSL Expected minimum version: 3.25 Version in use: 3.25

NSSUTIL Expected minimum version: 3.25 Version in use: 3.25

Experimental Features

hm thanks, most probably that's an issue with hardware acceleration... though your graphics drivers look fairly recent already, please see if there are updates available, or in case this doesn't solve the issue, disable hardware acceleration in the firefox menu ≡ > options > advanced > general (that setting will take a restart of the browser to take effect).

Yep, that did it, philipp! Disabling hardware acceleration solved the problem. Thank you!