[Bug 1363595] [NEW] Firefox 31 seems to shake randomly on some web page

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Hello I have two issues I think are related. sometimes Firefox freeze on
one tab when I click on a Firefox/thunderbird link or sometimes when I
look a a youtube video, it is random. When it freeze I can click on
another tab and have the correct title for it but the conten stay frozen
on the same tab. Sometimes it does not freeze but the web content shakes
itself and stop shaking when I open a new tab. I have tried safe mode :
same issue. I have created a new profile : same issue. Thanks

- I use Firefox 31
- I am on Ubuntu 14.04.01 32 bits
- I've tried making a new profile : no change
- i've tried to use safe mode : no change
- i have not tried to desactivate hardware acceleration so far
- I use the following video driver : nvidia 343.13 for an Nvidia GT740, I had the same issues with the previous GPU an Nvidia 8400 GS
- The problem was non existant before I upgrade from 12.4 to 14.04 early july 2014
- I've reported the issue to Mozilla but no solutions given works : https://support.mozilla.org/fr/questions/1014778?esab=a&s=&r=1&as=s   even disabling the Firefow bookmarks toolbar
- I have not encountered this issue on Chromium but did randomly meet it on one or two Ubuntu apps like for example : the compiz configuration program
--- 
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  yann       2303 F.... pulseaudio
 /dev/snd/controlC0:  yann       2303 F.... pulseaudio
 /dev/snd/controlC2:  yann       2303 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=1604c98d-ec9c-4c56-b311-87ad841b3f2c
InstallationDate: Installed on 2012-05-07 (845 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build i386 LIVE Binary 20120426-12:41
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=1260523f-6aa2-4b98-bb58-f39c240ca7d5 ro quiet splash
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-35-generic N/A
 linux-backports-modules-3.13.0-35-generic  N/A
 linux-firmware                             1.127.5
RfKill: Error: [Errno 2] Aucun fichier ou dossier de ce type
Tags:  trusty
Uname: Linux 3.13.0-35-generic i686
UpgradeStatus: Upgraded to trusty on 2014-07-17 (45 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 10/02/2007
dmi.bios.vendor: Intel Corp.
dmi.bios.version: DPP3510J.86A.0293.2007.1002.1519
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: DG33BU
dmi.board.vendor: Intel Corporation
dmi.board.version: AAD79951-406
dmi.chassis.type: 2
dmi.modalias: dmi:bvnIntelCorp.:bvrDPP3510J.86A.0293.2007.1002.1519:bd10/02/2007:svn:pn:pvr:rvnIntelCorporation:rnDG33BU:rvrAAD79951-406:cvn:ct2:cvr:

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


** Tags: apport-collected trusty
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Firefox 31 seems to shake randomly on some web page
https://bugs.launchpad.net/bugs/1363595
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