[Bug 300894] [NEW] Firefox hanging, sucking 95% of CPU before finally opening/closing page

[FourBrane]

Public bug reported:

Binary package hint: firefox-3.0

This is happening frequently. It may be associated with pages using Flash (but also sometimes just JavaScript). Most recent event was on http://www.amazon.com/20-000-Secrets-Tea-Effective/dp/0440235294/ref=pd_sim_b_1 
Had multiple (5) tabs open with three of them on Amazon. The Amazon pages hung and delayed before loadilng. Then, attempts to close each of the three Amazon tabs caused Firefox to gray out and spin CPU cycles like crazy again (up to 95% of CPU). After about  a minute, the pages load or close. They appear to operate normally once open.

Running Ubuntu 8.04 (Hardy)
firefox:
  Installed: 3.0.4+nobinonly-0ubuntu0.8.04.1
  Candidate: 3.0.4+nobinonly-0ubuntu0.8.04.1
  Version table:
 *** 3.0.4+nobinonly-0ubuntu0.8.04.1 0
        500 http://us.archive.ubuntu.com hardy-updates/main Packages
        500 http://us.archive.ubuntu.com hardy-security/main Packages
        500 http://security.ubuntu.com hardy-security/main Packages
        100 /var/lib/dpkg/status
     3.0~b5+nobinonly-0ubuntu3 0
        500 http://us.archive.ubuntu.com hardy/main Packages

I have Web Developer 1.1.16, Firebug 1.2.1, SQLite Manager 0.3.17,
AdBlock Plus 0.7.5.5, DOM Inspector 1.8.1.14, Colorful Tabs 3.7, and
StumbleUpon 3.26 installed.

ProblemType: Bug
Architecture: i386
Date: Fri Nov 21 22:12:06 2008
DistroRelease: Ubuntu 8.04
NonfreeKernelModules: nvidia
Package: firefox-3.0 3.0.4+nobinonly-0ubuntu0.8.04.1
PackageArchitecture: i386
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.24-21-386 i686

** Affects: firefox-3.0 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug

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Firefox hanging, sucking 95% of CPU before finally opening/closing page
https://bugs.launchpad.net/bugs/300894
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