Firefox used to stop animations (like animated GIFs) when the escape key was pressed. This capability seems to be missing from recent versions of Firefox. Please restore it.
Currently there are some partial work-arounds by editing about:config's image.animation_mode which can have values of normal (default), once, none. However, none of those provide the functionality of being able to stop the animation on demand, whether after a fraction of a second or after a few minutes.
What should happen is (barring changes to image.animation_mode) that Firefox should show the animation but then stop it if and when Escape is pressed.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: firefox 23.0~b4+build1-0ubuntu1
ProcVersionSignature: Ubuntu 3.10.0-5.15-generic 3.10.2
Uname: Linux 3.10.0-5-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.11-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: lars 1696 F.... pulseaudio
/dev/snd/controlC1: lars 1696 F.... pulseaudio
BuildID: 20130709093527
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Channel: Unavailable
Date: Wed Jul 31 13:39:39 2013
EcryptfsInUse: Yes
ForcedLayersAccel: False
InstallationDate: Installed on 2013-07-25 (5 days ago)
InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Alpha amd64+mac (20130725)
IpRoute:
default via 192.168.2.1 dev eth0 proto static
192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.36 metric 1
MarkForUpload: True
Plugins:
RealPlayer 9 - /usr/lib/mozilla/plugins/gecko-mediaplayer-rm.so (gecko-mediaplayer)
mplayerplug-in is now gecko-mediaplayer 1.0.8 - /usr/lib/mozilla/plugins/gecko-mediaplayer.so (gecko-mediaplayer)
QuickTime Plug-in 7.6.9 - /usr/lib/mozilla/plugins/gecko-mediaplayer-qt.so (gecko-mediaplayer)
DivX Browser Plug-In - /usr/lib/mozilla/plugins/gecko-mediaplayer-dvx.so (gecko-mediaplayer)
Windows Media Player Plug-in - /usr/lib/mozilla/plugins/gecko-mediaplayer-wmp.so (gecko-mediaplayer)
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=23.0/20130709093527 (In use)
RelatedPackageVersions: gecko-mediaplayer 1.0.8-1ubuntu1
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
dmi.bios.date: 06/28/07
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MM21.88Z.009A.B00.0706281359
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Mac-F4208EAA
dmi.board.vendor: Apple Inc.
dmi.board.version: PVT
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 4
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F4208EAA
dmi.modalias: dmi:bvnAppleInc.:bvrMM21.88Z.009A.B00.0706281359:bd06/28/07:svnAppleInc.:pnMacmini2,1:pvr1.0:rvnAppleInc.:rnMac-F4208EAA:rvrPVT:cvnAppleInc.:ct4:cvrMac-F4208EAA:
dmi.product.name: Macmini2,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
Status changed to 'Confirmed' because the bug affects multiple users.