Closing this, unless someone finds an actual bug with our Firefox build. As stated above, MSE is currently only enabled on Windows builds
** Changed in: firefox (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1439532 Title: Firefox 37 does not enable MSE required for YouTube HTML5 player Status in firefox package in Ubuntu: Invalid Bug description: After today's update to Firefox 37, the HTML5 video play on YouTube should work with hight resolutions that 720p. On a 14.04 installation it does work, but on my 15.04 installation it does not. This feature is part of the official Mozilla change log, so it must be a packaging bug. You can verify the status of MSE on this YouTube page: www.youtube.com/html5 . Firefox 37 is supposed to support all, but the last feature (VP9 with MSE). But Firefox on vivid apparently only supports the top row, in sufficient to watch higher resolution video. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: firefox 37.0+build2-0ubuntu1 ProcVersionSignature: Ubuntu 3.19.0-11.11-generic 3.19.3 Uname: Linux 3.19.0-11-generic x86_64 NonfreeKernelModules: wl AddonCompatCheckDisabled: False ApportVersion: 2.17-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC1D0p: jan 1466 F...m pulseaudio /dev/snd/controlC0: jan 1466 F.... pulseaudio /dev/snd/controlC1: jan 1466 F.... pulseaudio BuildID: 20150328222441 Channel: Unavailable CurrentDesktop: GNOME Date: Thu Apr 2 08:38:36 2015 EcryptfsInUse: Yes Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2015-01-30 (61 days ago) InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) IpRoute: default via 192.168.1.1 dev eth0 proto static metric 1024 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.29 Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-208cf555-adf2-48d2-adf5-fa49e2150319 Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so Gnome Shell Integration - /usr/lib/mozilla/plugins/libgnome-shell-browser-plugin.so (gnome-shell) PrefSources: prefs.js [Profile]/extensions/{8f8fe09b-0bd3-4470-bc1b-8cad42b8203a}/defaults/preferences/prefs.js /usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubu...@ubuntu.com/defaults/preferences/001ubuntu-gnome-mods.js ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash Profiles: Profile0 (Default) - LastVersion=37.0/20150328222441 (In use) RelatedPackageVersions: gnome-shell 3.14.4-0ubuntu1 RunningIncompatibleAddons: False SourcePackage: firefox SubmittedCrashIDs: bp-208cf555-adf2-48d2-adf5-fa49e2150319 Themes: extensions.sqlite corrupt or missing UpgradeStatus: Upgraded to vivid on 2015-03-19 (13 days ago) dmi.bios.date: 03/25/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A03 dmi.board.name: 0310JH dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: XPS 13 9343 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1439532/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp