Firefox 4.0 addons page very slow

[Serhiy]

Every time I open and/or scroll about:addons page system becomes unresponsible for about 5-10 seconds.
Through conky I see that Xorg takes all CPU resources.
I tried:
- removing ~/.mozilla ,
- downloading official build of firefox 4.0,
- force disabling and force enabling WebGL,
- disabling/enabling some compiz plugins,
- deleting libmoon (which is incompatible with 4.0 at this moment)
- exporting MOZ_DISABLE_PANGO=1 before starting firefox (advice from old bugreports)
and nothing helped.
The problem disappears right after I close addons page. But it also takes about 3-4 seconds to close the page.
I have something about 30 addons in total (without them problem still exists).
I believe it may be somehow connected to the usage of nouveau drivers (I have Nvidia GeForce FX5200 GPU).

Release: Ubuntu Natty 11.04 (development branch)
firefox: 4.0+nobinonly-0ubuntu1
unity: 3.8.8-0ubuntu2
xorg: 1:7.6+4ubuntu3
compiz:1:0.9.4+bzr20110415-0ubuntu1
uname -a: 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux

[IKT (ikt)]

Just wondering, are you able to test with the proprietary drivers?

Also does Firefox 4 config give you the option to disable using graphics hardware?

http://www.trishtech.com/internet/disable_hardware_acceleration_in_firefox_4.php

[Serhiy (xintx-ua)]

Not yet: at this moment proprietary drivers (nvidia-173) have unresolved dependency. It was suggested in another bugreport that they will be available short before Natty official release.

Hardware acceleration was enabled, but after disabling it and restarting firefox it took even longer, about 20 seconds to open addons page.

[Serhiy (xintx-ua)]

Found this bug in Mozilla's questions:
http://support.mozilla.com/en-US/questions/790987

[Serhiy (xintx-ua)]

It is not so serious but still present in the nightly build:
6.0~a1~hg20110413r68036+nobinonly-0ubuntu1~umd1

[Serhiy (xintx-ua)]

Purging firefox-globalmenu, ubufox and firefox-gnome-support doesn't help.

[madbiologist (me-again)]

Official support for Ubuntu 11.04 "Natty Narwhal" has ended. Is this bug still occurring on Ubuntu 14.10 "Utopic Unicorn" with Firefox 34?

[Launchpad Janitor (janitor)]

[Expired for firefox (Ubuntu) because there has been no activity for 60 days.]