Scrolling pages pressing mouse central button hangs, blocking the whole system until the scrolling reaches the end of the page

[AkumA]

Binary package hint: firefox-3.5

When I press the central mouse button the white circle with the arrows withing appears, sometimes it works as it should sometimes it hangs keeping a constant slow motion until it reaches the end of the page.
Nothing is clickable during this hang-on, the system doesn't respond even outiside Firefox.

ProblemType: Bug
Architecture: amd64
Date: Tue Nov 10 11:51:59 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: firefox-3.5 3.5.4+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-14-generic x86_64
XsessionErrors:
 (gnome-settings-daemon:4947): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (polkit-gnome-authentication-agent-1:5018): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-panel:5002): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -3 and height 24
 (nautilus:5003): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed

[phanyx (phanyx-deactivatedaccount)]

I experience the same problem both on latest Ubuntu and Debian Squeeze. I'm working on the latter now. The Firefox is downloaded from Firefox' homepage, my pc architecture is x86, GPU: nvidia with latest drivers from nvidia's homepage (190) and uname is as follows: Linux debian 2.6.30-2-486 i686 GNU/Linux.

I've noticed, that the problem is caused by adverts. When I install adblock + flashblock, pages, that caused the havoc in my system, stop being nasty. I can reproduce it easly on http://www.linuxquestions.org/ without and with adblock on.

So it looks like it's a weak cpu issue. I can't tell if there was a problem on my last Ubuntu 9.04, because I was browsing with adblock all the time.

[phanyx (phanyx-deactivatedaccount)]

Update:

Well, it seems, that the problem is not caused only by flash-like advers. On this url: http://alsa.opensrc.org/index.php/Playing_stereo_on_surround_sound_setup_%28Howto%29 the are several table-like objects, that also freeze my pc, when I use central mouse button scrolling, i.e. it's scrolling untill end of the page, without me being able to stop it, or to do anything else. This kind of issues definitelly didn't take place in Ubu 9.04.