firefox hangs on open dialog

Binary package hint: firefox

Open any web page. Click to link to download file. Save file dialog opens, but firefox hangs.
Edit -> Preferences Menu, Hangs it also.

Ubuntu/7.10 (gutsy) Firefox/2.0.0.4
Spanish Locale

***MEMORY-WARNING***: firefox-bin[10052]: GSlice: g_thread_init() must be called before all other GLib functions; memory corruption due to late invocation of g_thread_init() has been detected; this program is likely to crash, leak or unexpectedly abort soon...
*** glibc detected *** /usr/lib/firefox/firefox-bin: double free or corruption (out): 0x09550920 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb76d0f7d]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb76d45c0]
/usr/lib/libglib-2.0.so.0(g_free+0x31)[0xb74e38e1]
/usr/lib/firefox/components/libgfx_gtk.so[0xb5650be6]
/usr/lib/firefox/components/libgfx_gtk.so[0xb56701d9]
/usr/lib/firefox/components/libgklayout.so[0xb5793cfd]
/usr/lib/firefox/components/libgklayout.so[0xb5794a87]
/usr/lib/firefox/components/libgklayout.so[0xb57daadb]
/usr/lib/firefox/components/libgklayout.so[0xb58ebf01]
/usr/lib/firefox/components/libgklayout.so[0xb58ebd70]
/usr/lib/firefox/components/libgklayout.so[0xb58ecbbb]
/usr/lib/firefox/components/libgklayout.so[0xb58ebe65]
/usr/lib/firefox/components/libgklayout.so[0xb58ebd70]
/usr/lib/firefox/components/libgklayout.so[0xb58ecbbb]
/usr/lib/firefox/components/libgklayout.so[0xb58ebe65]
/usr/lib/firefox/components/libgklayout.so[0xb58ebd70]
/usr/lib/firefox/components/libgklayout.so[0xb58ecbbb]
/usr/lib/firefox/components/libgklayout.so[0xb5902585]
/usr/lib/firefox/components/libgklayout.so[0xb58ebd70]
/usr/lib/firefox/components/libgklayout.so[0xb58ecbbb]
/usr/lib/firefox/components/libgklayout.so[0xb58ebe65]
/usr/lib/firefox/components/libgklayout.so[0xb57ad285]
/usr/lib/firefox/components/libgklayout.so[0xb5a8bac5]
/usr/lib/firefox/components/libgklayout.so[0xb5a8e669]
/usr/lib/firefox/components/libgklayout.so[0xb5a94ab0]
/usr/lib/firefox/components/libgklayout.so[0xb5a96b79]
/usr/lib/firefox/components/libgklayout.so[0xb5a97998]
/usr/lib/firefox/components/libgklayout.so[0xb5a8b7c6]
/usr/lib/firefox/components/libwidget_gtk2.so[0xb66e930e]
/usr/lib/firefox/components/libwidget_gtk2.so[0xb66e0fb2]
/usr/lib/firefox/components/libwidget_gtk2.so[0xb66e103b]
/usr/lib/libgtk-x11-2.0.so.0[0xb7b8b472]
/usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x122)[0xb7575742]
/usr/lib/libgobject-2.0.so.0[0xb7587695]
/usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x6d6)[0xb75889a6]
/usr/lib/libgobject-2.0.so.0(g_signal_emit+0x29)[0xb7588d99]
/usr/lib/libgtk-x11-2.0.so.0[0xb7cc41e8]
/usr/lib/libgtk-x11-2.0.so.0(gtk_main_do_event+0x49d)[0xb7b847fd]
/usr/lib/libgdk-x11-2.0.so.0[0xb79c0651]
/usr/lib/libgdk-x11-2.0.so.0(gdk_window_process_all_updates+0x97)[0xb79c0877]
/usr/lib/libgdk-x11-2.0.so.0[0xb79c08db]
/usr/lib/libgdk-x11-2.0.so.0[0xb79a6968]
/usr/lib/libglib-2.0.so.0[0xb74da541]
/usr/lib/libglib-2.0.so.0(g_main_context_dispatch+0x17c)[0xb74dc10c]
/usr/lib/libglib-2.0.so.0[0xb74df54f]
/usr/lib/libglib-2.0.so.0(g_main_loop_run+0x1a9)[0xb74df8f9]
/usr/lib/libgtk-x11-2.0.so.0(gtk_main+0xb4)[0xb7b84be4]
/usr/lib/firefox/components/libwidget_gtk2.so[0xb66e7bf2]
/usr/lib/firefox/components/libtoolkitcomps.so[0xb65e8df2]
/usr/lib/firefox/firefox-bin[0x804f8e1]
/usr/lib/firefox/firefox-bin[0x804ab9f]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc)[0xb767eebc]
/usr/lib/firefox/firefox-bin[0x804aad1]
======= Memory map: ========
08048000-0805a000 r-xp 00000000 08:01 1419950 /usr/lib/firefox/firefox-bin
0805a000-0805b000 rw-p 00012000 08:01 1419950 /usr/lib/firefox/firefox-bin
0805b000-09576000 rw-p 0805b000 00:00 0 [heap]
b1577000-b15df000 r--p 00000000 08:01 1632275 /usr/share/fonts/truetype/ttf-dejavu/DejaVuSansCondensed-Oblique.ttf
b15df000-b1820000 rw-p b15df000 00:00 0
b1820000-b188f000 r--p 00000000 08:01 1632273 /usr/share/fonts/truetype/ttf-dejavu/DejaVuSansCondensed-Bold.ttf
b188f000-b1900000 r--p 00000000 08:01 1632276 /usr/share/fonts/truetype/ttf-dejavu/DejaVuSansCondensed.ttf
b1900000-b196c000 rw-p b1900000 00:00 0
b196c000-b1a00000 ---p b196c000 00:00 0
b1a1b000-b1a4e000 r-xp 00000000 08:01 1453001 /usr/lib/firefox/components/libmork.so
b1a4e000-b1a51000 rw-p 00032000 08:01 1453001 /usr/lib/firefox/components/libmork.so
b1a51000-b1a55000 r-xp 00000000 08:01 1143279 /lib/tls/i686/cmov/libnss_dns-2.5.so
b1a55000-b1a57000 rw-p 00003000 08:01 1143279 /lib/tls/i686/cmov/libnss_dns-2.5.so