Public bug reported:

This only started happening in 15.04, and it only seems to happen when I
use the video player's native fullscreen option (I sometimes use Flash
Game Maximizer if I'm hooked up to a dual monitor setup, and this
problem doesn't happen then).

Basically, I'm unable to make videos fullscreen because once I do, the
video slows, then stutters, then completely freezes (but the audio
continues unimpaired). I have to hit ESC many times to exit out because
everything else-- mouse, keyboard, etc. -- is unresponsive for about
half a minute.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: firefox 37.0.2+build1-0ubuntu0.15.04.1
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  mariellep   1888 F.... pulseaudio
 /dev/snd/pcmC1D0p:   mariellep   1888 F...m pulseaudio
 /dev/snd/controlC1:  mariellep   1888 F.... pulseaudio
BuildID: 20150417180400
Channel: Unavailable
CurrentDesktop: GNOME
Date: Wed May  6 20:24:05 2015
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 2014-04-30 (372 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 
(20140416.2)
IpRoute:
 default via 172.17.96.1 dev wlan0  proto static  metric 1024 
 107.0.114.185 via 172.17.96.1 dev wlan0  proto dhcp  metric 10 
 169.254.0.0/16 dev wlan0  scope link  metric 1000 
 172.17.96.0/20 dev wlan0  proto kernel  scope link  src 172.17.102.109
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-903c223f-5f88-44f6-b346-a50b32150428
Plugins:
 Widevine Media Optimizer - /usr/lib/pipelight/libpipelight-widevine.so
 Silverlight Plug-In - /usr/lib/pipelight/libpipelight-silverlight5.1.so
 Gnome Shell Integration - 
/usr/lib/mozilla/plugins/libgnome-shell-browser-plugin.so (gnome-shell)
 iTunes Application Detector - 
/usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so 
(rhythmbox-mozilla)
 Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources:
 prefs.js
 
/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubu...@ubuntu.com/defaults/preferences/001ubuntu-gnome-mods.js
Profiles: Profile0 (Default) - LastVersion=37.0.2/20150417180400 (In use)
RelatedPackageVersions:
 gnome-shell       3.14.4-0ubuntu1
 rhythmbox-mozilla 3.1-1ubuntu3
RunningIncompatibleAddons: False
SourcePackage: firefox
SubmittedCrashIDs:
 bp-903c223f-5f88-44f6-b346-a50b32150428
 bp-e6646dc6-555e-45c4-a11b-728b62140917
 bp-bbf9a546-0e42-428c-9cc0-165d42140909
 bp-796833a5-3fe5-4ce2-8cec-21ba32140906
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to vivid on 2015-04-24 (12 days ago)
dmi.bios.date: 07/05/2013
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: 1.10
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: MP
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis Manufacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: 
dmi:bvnInsydeCorp.:bvr1.10:bd07/05/2013:svnTOSHIBA:pnSatelliteL50-A:pvrPSKLJU-01T01V:rvnTOSHIBA:rnPortablePC:rvrMP:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
dmi.product.name: Satellite L50-A
dmi.product.version: PSKLJU-01T01V
dmi.sys.vendor: TOSHIBA

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1452541

Title:
  Fullscreen window for streaming video (YouTube, HBO Go, etc.) freezing

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