Description: opening a bookmark bar folder or menu (even the Firefox button) or a submenu results in a freeze for about 2-3 seconds before the menu/bookmark folder content appear. I noticed this behavior after a massive system update regarding Gnome 2.32, and even Pango was updated. Pacman log attached below.

Additional info:
* package version(s)
Firefox: extra/firefox 7.0.1-1

* config and/or log files etc.
[2011-10-02 13:23] starting full system upgrade
[2011-10-02 13:26] upgraded glib2 (2.28.8-1 -> 2.30.0-1)
[2011-10-02 13:26] upgraded atk (2.0.1-1 -> 2.2.0-1)
[2011-10-02 13:26] warning: undefined reference to <schema id='org.gnome.desktop.default-applications.at'/>
[2011-10-02 13:26] upgraded dconf (0.8.0-1 -> 0.10.0-1)
[2011-10-02 13:26] upgraded pango (1.28.4-3 -> 1.29.4-1)
[2011-10-02 13:26] installed colord (0.1.12-2)
[2011-10-02 13:26] warning: undefined reference to <schema id='org.gnome.desktop.default-applications.at'/>
[2011-10-02 13:26] upgraded gtk3 (3.0.12-1 -> 3.2.0-1)
[2011-10-02 13:26] upgraded gconf (2.32.4-1 -> 3.2.0-1)
[2011-10-02 13:26] upgraded glibmm (2.28.2-1 -> 2.30.0-1)
[2011-10-02 13:26] upgraded gsettings-desktop-schemas (3.0.1-2 -> 3.2.0-1)
[2011-10-02 13:26] upgraded glib-networking (2.28.7-5 -> 2.30.0-1)
[2011-10-02 13:26] upgraded libgnome-keyring (3.0.3-1 -> 3.2.0-1)
[2011-10-02 13:26] installed libgdu (3.0.2-2)
[2011-10-02 13:26] upgraded gnome-disk-utility (3.0.2-1 -> 3.0.2-2)
[2011-10-02 13:27] upgraded gnome-icon-theme-symbolic (3.0.0-1 -> 3.2.0-1)
[2011-10-02 13:27] upgraded gnome-icon-theme (3.0.0-2 -> 3.2.0-1)
[2011-10-02 13:27] upgraded gnome-menus (3.0.1-1 -> 3.2.0.1-1)
[2011-10-02 13:27] upgraded gobject-introspection (0.10.8-1 -> 1.30.0-1)
[2011-10-02 13:27] upgraded gparted (0.9.1-1 -> 0.9.1-2)
[2011-10-02 13:27] upgraded gtk-doc (1.17-1 -> 1.18-1)
[2011-10-02 13:27] upgraded gucharmap (3.0.1-1 -> 3.2.0-1)
[2011-10-02 13:27] upgraded libsoup (2.34.3-1 -> 2.36.0-1)
[2011-10-02 13:27] upgraded libsoup-gnome (2.34.3-1 -> 2.36.0-1)
[2011-10-02 13:27] upgraded gvfs (1.8.2-1 -> 1.10.0-2)
[2011-10-02 13:27] upgraded gvfs-smb (1.8.2-1 -> 1.10.0-2)
[2011-10-02 13:27] installed json-c (0.9-1)
[2011-10-02 13:27] installed lib32-json-c (0.9-1)
[2011-10-02 13:27] installed lib32-libsamplerate (0.1.7-3)
[2011-10-02 13:27] warning: /etc/pulse/client.conf installed as /etc/pulse/client.conf.pacnew
[2011-10-02 13:27] upgraded libpulse (0.9.23-1 -> 1.0-2)
[2011-10-02 13:27] upgraded lib32-libpulse (0.9.23-1 -> 1.0-2)
[2011-10-02 13:27] upgraded libcanberra (0.28-1 -> 0.28-2)
[2011-10-02 13:28] upgraded libgweather (3.0.2-1 -> 3.2.0-1)
[2011-10-02 13:28] upgraded libwebkit (1.4.3-1 -> 1.6.1-1)
[2011-10-02 13:28] upgraded p7zip (9.20.1-4 -> 9.20.1-5)
[2011-10-02 13:28] installed libcanberra-pulse (0.28-2)
[2011-10-02 13:28] installed gtkmm3 (3.2.0-1)
[2011-10-02 13:28] upgraded pavucontrol (0.9.10-4 -> 1.0-1)
[2011-10-02 13:28] upgraded polkit-gnome (0.101-3 -> 0.103-1)
[2011-10-02 13:28] upgraded pygobject2-devel (2.28.6-1 -> 2.28.6-4)
[2011-10-02 13:28] upgraded python2-gobject2 (2.28.6-1 -> 2.28.6-4)
[2011-10-02 13:28] upgraded python-gtop (2.32.0-6 -> 2.32.0-7)
[2011-10-02 13:28] upgraded python-rsvg (2.32.0-6 -> 2.32.0-7)
[2011-10-02 13:28] installed libplist (1.4-1)
[2011-10-02 13:28] installed usbmuxd (1.0.7-2)
[2011-10-02 13:28] installed libimobiledevice (1.1.1-2)
[2011-10-02 13:28] upgraded upower (0.9.12-1 -> 0.9.13-2)
[2011-10-02 13:28] upgraded vala (0.12.1-1 -> 0.14.0-1)
[2011-10-02 13:28] upgraded vte-common (0.28.2-1 -> 0.30.0-1)
[2011-10-02 13:28] upgraded vte (0.28.2-1 -> 0.28.2-2)
[2011-10-02 13:28] upgraded wine (1.3.29-1 -> 1.3.29-2)
[2011-10-02 13:28] installed perl-uri (1.58-1)
[2011-10-02 13:28] installed perl-html-tagset (3.20-2)
[2011-10-02 13:28] installed perl-html-parser (3.68-2)
[2011-10-02 13:28] installed perl-libwww (5.837-1)
[2011-10-02 13:28] upgraded xscreensaver (5.15-1 -> 5.15-2)
[2011-10-02 13:28] upgraded zenity (3.0.0-2 -> 3.2.0-1)


Steps to reproduce: open a menu/bookmark folder with the indicated version of Firefox and you should see a little freeze/wait.