This bug appears to have regressed on Natty:
$ LD_LIBRARY_PATH=/usr/lib32 ./firefox
(firefox-bin:9327): Gtk-WARNING **: /usr/lib/gtk-2.0/2.10.0/immodules/im-ibus.so: wrong ELF class: ELFCLASS64
(firefox-bin:9327): Gtk-WARNING **: Loading IM context type 'ibus' failed /usr/lib/gio/modules/libgiobamf.so: wrong ELF class: ELFCLASS64 Failed to load module: /usr/lib/gio/modules/libgiobamf.so /usr/lib/gio/modules/libgvfsdbus.so: wrong ELF class: ELFCLASS64 Failed to load module: /usr/lib/gio/modules/libgvfsdbus.so
(firefox-bin:9327): Gtk-WARNING **: Error loading theme icon 'gtk-go-back-ltr' for stock: Unable to load image-loading module: /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-svg.so: /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-svg.so: wrong ELF class: ELFCLASS64 ...
This bug appears to have regressed on Natty:
$ LD_LIBRARY_ PATH=/usr/ lib32 ./firefox
(firefox- bin:9327) : Gtk-WARNING **: /usr/lib/ gtk-2.0/ 2.10.0/ immodules/ im-ibus. so: wrong ELF class: ELFCLASS64
(firefox- bin:9327) : Gtk-WARNING **: Loading IM context type 'ibus' failed lib/gio/ modules/ libgiobamf. so: wrong ELF class: ELFCLASS64 gio/modules/ libgiobamf. so lib/gio/ modules/ libgvfsdbus. so: wrong ELF class: ELFCLASS64 gio/modules/ libgvfsdbus. so
/usr/
Failed to load module: /usr/lib/
/usr/
Failed to load module: /usr/lib/
(firefox- bin:9327) : Gtk-WARNING **: Error loading theme icon 'gtk-go-back-ltr' for stock: Unable to load image-loading module: /usr/lib/ gdk-pixbuf- 2.0/2.10. 0/loaders/ libpixbufloader -svg.so: /usr/lib/ gdk-pixbuf- 2.0/2.10. 0/loaders/ libpixbufloader -svg.so: wrong ELF class: ELFCLASS64
...