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 42.0 Build ID 20151029151421 Update History Update Channel release User Agent Mozilla/5.0 (Windows NT 10.0; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0 Profile Folder Enabled Plugins about:plugins Build Configuration about:buildconfig Memory Use about:memory Registered Service Workers about:serviceworkers Multiprocess Windows 0/1 (default: false) Safe Mode false Crash Reports for the Last 3 Days Report ID Submitted

All Crash Reports Extensions Name Version Enabled ID Adblock Plus 2.6.11 true {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} Greasemonkey 3.5 true {e4a8a97b-f2ed-450b-b12d-ee082ba24781} NextVid Stopper for YouTube 1.1.1-signed true jid1-8tHTvv1Wsu98MQ@jetpack YouTube HD 0.1.7 true jid0-RjdrEcWS3Ggt4xydeqVS8WQk1Lu@jetpack YouTube High Definition 42.0 false {7b1bf0b6-a1b9-42b0-b75d-252036438bdc} Graphics Adapter Description Intel(R) HD Graphics Adapter Drivers igdumd64 igd10umd64 igd10umd64 igdumd32 igd10umd32 igd10umd32 Adapter RAM Unknown Asynchronous Pan/Zoom none Device ID 0x0102 DirectWrite Enabled false (10.0.10240.16430) Driver Date 5-27-2015 Driver Version 9.17.10.4229 GPU #2 Active false GPU Accelerated Windows 0/1 Basic (OMTC) Subsys ID 05891025 Supports Hardware H264 Decoding false Vendor ID 0x8086 WebGL Renderer Google Inc. -- ANGLE (Intel(R) HD Graphics Direct3D11 vs_4_1 ps_4_1) windowLayerManagerRemote true AzureCanvasBackend skia AzureContentBackend cairo AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0 Important Modified Preferences Name Value accessibility.accesskeycausesactivation false 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 2 browser.download.importedFromSqlite true browser.places.smartBookmarksVersion 7 browser.sessionstore.upgradeBackup.latestBuildID 20151029151421 browser.startup.homepage_override.buildID 20151029151421 browser.startup.homepage_override.mstone 42.0 dom.apps.reset-permissions true dom.ipc.plugins.flash.disable-protected-mode true dom.mozApps.used true extensions.lastAppVersion 42.0 gfx.direct2d.disabled true gfx.direct3d.last_used_feature_level_idx 0 gfx.driver-init.appVersion 41.0.2 gfx.driver-init.deviceID 0x0102 gfx.driver-init.driverVersion 9.17.10.4229 gfx.driver-init.feature-d2d false gfx.driver-init.feature-d3d11 true gfx.driver-init.status 2 layers.acceleration.disabled true media.gmp-eme-adobe.abi x86-msvc media.gmp-eme-adobe.lastUpdate 1446769714 media.gmp-eme-adobe.version 15 media.gmp-gmpopenh264.lastUpdate 1443826799 media.gmp-gmpopenh264.version 1.4 media.gmp-manager.buildID 20151029151421 media.gmp-manager.lastCheck 1446857114 media.hardware-video-decoding.failed false network.cookie.prefsMigrated true network.predictor.cleaned-up true places.database.lastMaintenance 1446417549 places.history.expiration.transient_current_max_pages 104858 plugin.disable_full_page_plugin_for_types application/pdf plugin.importedState true plugin.state.npdeployjava 0 print.printer_Send_To_OneNote_2010.print_bgcolor false print.printer_Send_To_OneNote_2010.print_bgimages false print.printer_Send_To_OneNote_2010.print_duplex -437918235 print.printer_Send_To_OneNote_2010.print_edge_bottom 0 print.printer_Send_To_OneNote_2010.print_edge_left 0 print.printer_Send_To_OneNote_2010.print_edge_right 0 print.printer_Send_To_OneNote_2010.print_edge_top 0 print.printer_Send_To_OneNote_2010.print_evenpages true print.printer_Send_To_OneNote_2010.print_footercenter print.printer_Send_To_OneNote_2010.print_footerleft &PT print.printer_Send_To_OneNote_2010.print_footerright &D print.printer_Send_To_OneNote_2010.print_headercenter print.printer_Send_To_OneNote_2010.print_headerleft &T print.printer_Send_To_OneNote_2010.print_headerright &U print.printer_Send_To_OneNote_2010.print_in_color true print.printer_Send_To_OneNote_2010.print_margin_bottom 0.5 print.printer_Send_To_OneNote_2010.print_margin_left 0.5 print.printer_Send_To_OneNote_2010.print_margin_right 0.5 print.printer_Send_To_OneNote_2010.print_margin_top 0.5 print.printer_Send_To_OneNote_2010.print_oddpages true print.printer_Send_To_OneNote_2010.print_orientation 0 print.printer_Send_To_OneNote_2010.print_page_delay 50 print.printer_Send_To_OneNote_2010.print_paper_data 1 print.printer_Send_To_OneNote_2010.print_paper_height 11.00 print.printer_Send_To_OneNote_2010.print_paper_name print.printer_Send_To_OneNote_2010.print_paper_size_type 0 print.printer_Send_To_OneNote_2010.print_paper_size_unit 0 print.printer_Send_To_OneNote_2010.print_paper_width 8.50 print.printer_Send_To_OneNote_2010.print_resolution -437918235 print.printer_Send_To_OneNote_2010.print_reversed false print.printer_Send_To_OneNote_2010.print_scaling 1.00 print.printer_Send_To_OneNote_2010.print_shrink_to_fit true print.printer_Send_To_OneNote_2010.print_to_file false print.printer_Send_To_OneNote_2010.print_unwriteable_margin_bottom 0 print.printer_Send_To_OneNote_2010.print_unwriteable_margin_left 0 print.printer_Send_To_OneNote_2010.print_unwriteable_margin_right 0 print.printer_Send_To_OneNote_2010.print_unwriteable_margin_top 0 privacy.sanitize.migrateFx3Prefs true storage.vacuum.last.index 1 storage.vacuum.last.places.sqlite 1446505283 Important Locked Preferences Name Value JavaScript Incremental GC true Accessibility Activated false Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.10.10 4.10.10 NSS 3.19.4 Basic ECC 3.19.4 Basic ECC NSSSMIME 3.19.4 Basic ECC 3.19.4 Basic ECC NSSSSL 3.19.4 Basic ECC 3.19.4 Basic ECC NSSUTIL 3.19.4 3.19.4 Experimental Features Name ID Description Active End Date Homepage

thank you, can you try to replicate this behaviour when you launch firefox in safe mode once as well? if not, maybe an addon is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

I have tried Safe Mode and it's the same.

what results do you get shown when you visit https://www.youtube.com/html5 with firefox?

What does this browser support?

   HTMLVideoElement supported
   H.264 supported
   WebM VP8 supported

   Media Source Extensions supported
   MSE & H.264 supported
   MSE & WebM VP9 not supported

philipp, did you look at my question?

yes, unfortunately i'm pretty much out of ideas, since everything is looking as expected there as well. as a last resort you could try to refresh firefox and see if this can make a difference...

I don't think it really will.

Hello philipp, I never really had this problem before Firefox 42. Not even resetting or making an alt profile will work.

I am having the same problem. Sure hope someone has some idea what is happening. And maybe a solution?

Does it work in a new New Private Window?

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) to see if that helps in case security software is involved.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

JohnDeaux said

I am having the same problem. Sure hope someone has some idea what is happening. And maybe a solution?

Can you do what cor-el is telling you to do?

Hello co-rel, I'm pretty sure this won't. I also get 1:11:26:55 on the player. I'm trying to keep this thread alive. It seems that Firefox screws up every time an update happens.

cor-el said

Does it work in a new New Private Window? Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) to see if that helps in case security software is involved.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

Look at the post I made above. Bleeping Computer and such won't really help. This doesn't happen on Opera.

cor-el said

Does it work in a new New Private Window? Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) to see if that helps in case security software is involved.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

Hello co-rel, it does not work in a new private window. The only way to solve this issue is by using a different browser.

philipp said

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...

I did all of the steps provided. You guys are not helping.

philipp said

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...

I did all of the steps provided. You guys are not helping.

Does it help if you disable the HTML5 media player for YouTube and use a Flash player?

You can use an extension to switch between the Flash player and the HTML5 media player on the YouTube website. YouTube Flash Video Player:

• https://addons.mozilla.org/firefox/addon/youtube-flash-video-player/

You can also try to disable MSE:

• media.mediasource.enabled = false

• media.windows-media-foundation.enabled
• media.directshow.enabled

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

Did you try to boot the computer in Windows Safe Mode?

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) to see if that helps.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

Well, that doesn't really help cor-el.