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...

Also, I've realized that CPU usage during playing videos is up to 100 percents.

philipp, just copy information as the text?

yes, use the text version - that's easier to read for humans :-)

Application Basics Name Firefox Version 48.0 Build ID 20160726073904 Update History Update Channel release User Agent Mozilla/5.0 (Windows NT 10.0; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0 OS Windows_NT 10.0 x86 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 Adblock Plus 2.7.3 true {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} Firefox Hello Beta 1.4.4 true loop@mozilla.org Multi-process staged rollout 1.1 true e10srollout@mozilla.org Pocket 1.0.4 true firefox@getpocket.com Graphics Features Compositing Direct3D 11 Asynchronous Pan/Zoom none WebGL Renderer Google Inc. -- ANGLE (NVIDIA GeForce GPU Direct3D11 vs_5_0 ps_5_0) Hardware H264 Decoding No; DXVA2D3D11 crashes detected in the past; IDirectXVideoDecoderServer::GetDecoderDeviceGuids failed with error 80004005 Direct2D true DirectWrite true (10.0.14393.0) GPU #1 Active Yes Description Intel(R) HD Graphics 520 Vendor ID 0x8086 Device ID 0x1916 Driver Version 20.19.15.4474 Driver Date 6-13-2016 Drivers igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Subsys ID 00141414 RAM Unknown GPU #2 Active No Description NVIDIA GeForce GPU Vendor ID 0x10de Device ID 0x134b Driver Version 10.18.13.6472 Driver Date 4-27-2016 Drivers nvd3dumx,nvwgf2umx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um,nvwgf2um Subsys ID 00081414 RAM 1024 Diagnostics AzureCanvasAccelerated 0 AzureCanvasBackend direct2d 1.1 AzureContentBackend direct2d 1.1 AzureFallbackCanvasBackend cairo failures [GFX1-]: VendorIDMismatch V 0x8086 0x10de Failure Log (#0) Error VendorIDMismatch V 0x8086 0x10de (#1) Error DXVA2D3D11 video decoding is disabled due to a previous crash. Important Modified Preferences Name Value accessibility.lastLoadDate 1471467503 accessibility.loadedInLastSession true 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 1 browser.download.importedFromSqlite true browser.places.smartBookmarksVersion 8 browser.sessionstore.upgradeBackup.latestBuildID 20160726073904 browser.startup.homepage_override.buildID 20160726073904 browser.startup.homepage_override.mstone 48.0 browser.urlbar.daysBeforeHidingSuggestionsPrompt 0 browser.urlbar.lastSuggestionsPromptDate 20160811 browser.urlbar.suggest.searches true dom.apps.reset-permissions true extensions.lastAppVersion 48.0 font.internaluseonly.changed true general.useragent.locale en gfx.crash-guard.d3d11layers.appVersion 48.0 gfx.crash-guard.d3d11layers.deviceID 0x1916 gfx.crash-guard.d3d11layers.driverVersion 20.19.15.4474 gfx.crash-guard.d3d11layers.feature-d2d true gfx.crash-guard.d3d11layers.feature-d3d11 true gfx.crash-guard.status. 3 gfx.crash-guard.status.d3d11layers 2 gfx.crash-guard.status.d3d9video 2 media.benchmark.vp9.fps 172 media.benchmark.vp9.versioncheck 1 media.gmp-manager.buildID 20160726073904 media.gmp-manager.lastCheck 1471381968 media.gmp.storage.version.observed 1 media.hardware-video-decoding.failed false media.webrtc.debug.log_file C:\Users\miksi\AppData\Local\Temp\WebRTC.log network.cookie.prefsMigrated true network.predictor.cleaned-up true places.database.lastMaintenance 1471353910 places.history.expiration.transient_current_max_pages 104858 plugin.disable_full_page_plugin_for_types application/pdf plugin.importedState true privacy.cpd.offlineApps true privacy.cpd.siteSettings true privacy.sanitize.timeSpan 0 services.sync.declinedEngines storage.vacuum.last.index 1 storage.vacuum.last.places.sqlite 1470686620 ui.osk.debug.keyboardDisplayReason IKPOS: ConvertibleSlateMode is non-zero Important Locked Preferences Name Value JavaScript Incremental GC true Accessibility Activated true Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.12 4.12 NSS 3.24 Basic ECC 3.24 Basic ECC NSSSMIME 3.24 Basic ECC 3.24 Basic ECC NSSSSL 3.24 Basic ECC 3.24 Basic ECC NSSUTIL 3.24 3.24

thanks. could you refresh firefox as hardware acceleration in your profile is currently disabled because of prior detected crashes that may be attributable to hwa?

please also see if there are newer drivers available for your two graphics cards... Upgrade your graphics drivers to use hardware acceleration and WebGL

I've downloaded the latest drivers before contacting Mozilla support. Unfortunately, refreshing didn't change anything.

can you post your troubleshooting information from after the refresh again?

Firefox Version 48.0 Build ID 20160726073904 Update History Update Channel release User Agent Mozilla/5.0 (Windows NT 10.0; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0 OS Windows_NT 10.0 x86 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 Adblock Plus 2.7.3 true {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} Firefox Hello Beta 1.4.4 true loop@mozilla.org Multi-process staged rollout 1.1 true e10srollout@mozilla.org Pocket 1.0.4 true firefox@getpocket.com YouTube ALL HTML5 3.0.3 true jid1-qj0w91o64N7Eeg@jetpack Graphics Features Compositing Direct3D 11 Asynchronous Pan/Zoom none WebGL Renderer Google Inc. -- ANGLE (Intel(R) HD Graphics 520 Direct3D11 vs_5_0 ps_5_0) Hardware H264 Decoding Yes; Using D3D11 API Direct2D true DirectWrite true (10.0.10586.494) GPU #1 Active Yes Description Intel(R) HD Graphics 520 Vendor ID 0x8086 Device ID 0x1916 Driver Version 20.19.15.4463 Driver Date 7-6-2016 Drivers igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Subsys ID 00141414 RAM Unknown GPU #2 Active No Description NVIDIA GeForce GPU Vendor ID 0x10de Device ID 0x134b Driver Version 10.18.13.6472 Driver Date 4-27-2016 Drivers nvd3dumx,nvwgf2umx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um,nvwgf2um Subsys ID 00081414 RAM 1024 Diagnostics AzureCanvasAccelerated 0 AzureCanvasBackend direct2d 1.1 AzureContentBackend direct2d 1.1 AzureFallbackCanvasBackend cairo Important Modified Preferences Name Value accessibility.lastLoadDate 1471510636 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 8 browser.sessionstore.upgradeBackup.latestBuildID 20160726073904 browser.startup.homepage_override.buildID 20160726073904 browser.startup.homepage_override.mstone 48.0 browser.urlbar.daysBeforeHidingSuggestionsPrompt 3 browser.urlbar.lastSuggestionsPromptDate 20160818 dom.apps.reset-permissions true extensions.lastAppVersion 48.0 gfx.crash-guard.d3d11layers.appVersion 48.0 gfx.crash-guard.d3d11layers.deviceID 0x1916 gfx.crash-guard.d3d11layers.driverVersion 20.19.15.4463 gfx.crash-guard.d3d11layers.feature-d2d true gfx.crash-guard.d3d11layers.feature-d3d11 true gfx.crash-guard.status. 2 gfx.crash-guard.status.d3d11layers 2 gfx.crash-guard.status.d3d9video 2 media.benchmark.vp9.fps 151 media.benchmark.vp9.versioncheck 1 media.gmp-eme-adobe.abi x86-msvc-x64 media.gmp-eme-adobe.lastUpdate 1471468161 media.gmp-eme-adobe.version 17 media.gmp-gmpopenh264.abi x86-msvc-x64 media.gmp-gmpopenh264.lastUpdate 1471468162 media.gmp-gmpopenh264.version 1.6 media.gmp-manager.buildID 20160726073904 media.gmp-manager.lastCheck 1471468156 media.gmp-widevinecdm.abi x86-msvc-x64 media.gmp-widevinecdm.lastUpdate 1471468166 media.gmp-widevinecdm.version 1.4.8.866 media.gmp.storage.version.observed 1 media.hardware-video-decoding.failed false media.webrtc.debug.log_file C:\Users\miksi\AppData\Local\Temp\WebRTC.log network.cookie.prefsMigrated true network.predictor.cleaned-up true places.database.lastMaintenance 1471473781 places.history.expiration.transient_current_max_pages 104858 plugin.disable_full_page_plugin_for_types application/pdf plugin.importedState true storage.vacuum.last.index 0 storage.vacuum.last.places.sqlite 1471473781 ui.osk.debug.keyboardDisplayReason IKPOS: ConvertibleSlateMode is non-zero Important Locked Preferences Name Value JavaScript Incremental GC true Accessibility Activated true Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.12 4.12 NSS 3.24 Basic ECC 3.24 Basic ECC NSSSMIME 3.24 Basic ECC 3.24 Basic ECC NSSSSL 3.24 Basic ECC 3.24 Basic ECC NSSUTIL 3.24 3.24

thanks, at least hardware acceleration seems to be on again in firefox after the refresh. could you try if disabling pinch-to-zoom in the windows trackpad settings is making a difference in regard to scrolling smoothness (https://bugzilla.mozilla.org/show_bug.cgi?id=1227858)?

Sorry, I've realized the strange thing. Immediately after making refresh (during first launching the Firefox) CPU usage is normal, and all is relatively smooth. But once I launch it second time (and so on) the problem is returned.

Here is troubleshooting information for first time launching. Name Firefox Version 48.0 Build ID 20160726073904 Update History Update Channel release User Agent Mozilla/5.0 (Windows NT 10.0; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0 OS Windows_NT 10.0 x86 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 1.4.3 true loop@mozilla.org Multi-process staged rollout 1.0 true e10srollout@mozilla.org Pocket 1.0.4 true firefox@getpocket.com Graphics Features Compositing Direct3D 11 Asynchronous Pan/Zoom none WebGL Renderer Google Inc. -- ANGLE (Intel(R) HD Graphics 520 Direct3D11 vs_5_0 ps_5_0) Hardware H264 Decoding Yes; Using D3D11 API Direct2D true DirectWrite true (10.0.10586.494) GPU #1 Active Yes Description Intel(R) HD Graphics 520 Vendor ID 0x8086 Device ID 0x1916 Driver Version 20.19.15.4463 Driver Date 7-6-2016 Drivers igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Subsys ID 00141414 RAM Unknown GPU #2 Active No Description NVIDIA GeForce GPU Vendor ID 0x10de Device ID 0x134b Driver Version 10.18.13.6472 Driver Date 4-27-2016 Drivers nvd3dumx,nvwgf2umx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um,nvwgf2um Subsys ID 00081414 RAM 1024 Diagnostics AzureCanvasAccelerated 0 AzureCanvasBackend direct2d 1.1 AzureContentBackend direct2d 1.1 AzureFallbackCanvasBackend cairo Important Modified Preferences Name Value accessibility.lastLoadDate 1471512705 browser.cache.disk.capacity 1048576 browser.cache.disk.filesystem_reported 1 browser.cache.disk.smart_size.first_run false browser.cache.frecency_experiment 1 browser.download.importedFromSqlite true browser.places.smartBookmarksVersion 8 browser.sessionstore.upgradeBackup.latestBuildID 20160726073904 browser.startup.homepage_override.buildID 20160726073904 browser.startup.homepage_override.mstone 48.0 dom.apps.reset-permissions true extensions.lastAppVersion 48.0 gfx.crash-guard.d3d11layers.appVersion 48.0 gfx.crash-guard.d3d11layers.deviceID 0x1916 gfx.crash-guard.d3d11layers.driverVersion 20.19.15.4463 gfx.crash-guard.d3d11layers.feature-d2d true gfx.crash-guard.d3d11layers.feature-d3d11 true gfx.crash-guard.status. 2 gfx.crash-guard.status.d3d11layers 2 media.benchmark.vp9.fps 157 media.benchmark.vp9.versioncheck 1 media.gmp.storage.version.observed 1 media.hardware-video-decoding.failed false network.cookie.prefsMigrated true places.history.expiration.transient_current_max_pages 104858 plugin.disable_full_page_plugin_for_types application/pdf Important Locked Preferences Name Value JavaScript Incremental GC true Accessibility Activated true Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.12 4.12 NSS 3.24 Basic ECC 3.24 Basic ECC NSSSMIME 3.24 Basic ECC 3.24 Basic ECC NSSSSL 3.24 Basic ECC 3.24 Basic ECC NSSUTIL 3.24 3.24

hmm, in this case i think a bug report about this issue at bugzilla.mozilla.org with a sample url that exhibits this behaviour and clear steps to reproduce might be your best shot at getting this adressed. afaik a couple of mozilla developers are also using surfacebooks, so there is a big chance that they are interested in fixing such a bug :-)