Pages with unresponsive scripts cause extremely long hangs

[José Alburquerque]

This bug makes firefox practically unusable for me. It seems I run into a lot of pages with "unresponsive scripts" (I guess that's what it is). They make firefox hang for a long time before it continues. If a menu is up, the hanging causes the entire system to be unusable. To see the bug go to the following page (for example) and in the C++ Documentation section click on the "C++ Language Tutorial" link.:

http://www.cplusplus.com/

For me the tutorial page hangs every time I go to it. It happens for pages on github.com, for example and quite a few other pages in my presently saved session.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: firefox 7.0~b1+build1+nobinonly-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-9.13-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
NonfreeKernelModules: nvidia
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: jose 7763 F.... pulseaudio
 /dev/snd/controlC0: jose 7763 F.... pulseaudio
BuildID: 20110819161726
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'ALS4000'/'Avance Logic ALS4000 at 0xb400, irq 17'
   Mixer name : 'ALS4000'
   Components : 'ALS4000'
   Controls : 30
   Simple ctrls : 20
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xfe024000 irq 22'
   Mixer name : 'Realtek ALC887'
   Components : 'HDA:10ec0887,1458a002,00100202'
   Controls : 38
   Simple ctrls : 21
Channel: beta
Date: Tue Aug 23 14:25:03 2011
ForcedLayersAccel: False
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
IpRoute:
 default via 192.168.1.1 dev eth1 metric 100
 169.254.0.0/16 dev eth1 scope link metric 1000
 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.100
IwConfig: Error: [Errno 2] No such file or directory
PciNetwork:

ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profiles:
 Profile0 - LastVersion=7.0/20110819161726
 Profile1 - LastVersion=7.0/20110819161726
 Profile2 (Default) - LastVersion=7.0/20110819161726 (Running)
 Profile3 - LastVersion=6.0/20110809235631 (Out of date)
RelatedPackageVersions:
 gecko-mediaplayer 1.0.4-2ubuntu1
 totem-mozilla 3.0.1-0ubuntu4
 icedtea-plugin 1.1.1-1ubuntu2
 rhythmbox-plugins 2.90.1~20110802-0ubuntu2
RfKill: Error: [Errno 2] No such file or directory
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to oneiric on 2011-08-19 (3 days ago)
dmi.bios.date: 11/18/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F1
dmi.board.name: M68M-S2P
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd11/18/2009:svnGigabyteTechnologyCo.,Ltd.:pnM68M-S2P:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnM68M-S2P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: M68M-S2P
dmi.sys.vendor: Gigabyte Technology Co., Ltd.