Firefox 3.5.2 crashes when visiting page with flash content

Crashing on karmic when open http://tv.repubblica.it

On the same system everything works with firefox 3.0.13

lsb_release -rd
Description: Ubuntu karmic (development branch)
Release: 9.10

firefox version 3.5.2+nobinonly-0ubuntu2
flash version 10.0.32.18ubuntu1

Unfortunately apport didn't start, starting firefox from command line I get

 shaitan@lore:~$ firefox
*** glibc detected *** /usr/lib/firefox-3.5.2/firefox: free(): invalid pointer: 0xb1452720 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0x4050d1]
/lib/tls/i686/cmov/libc.so.6[0x4067d2]
/lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0x40987d]
/usr/lib/libGL.so.1[0x475c205]
======= Memory map: ========
00110000-001f5000 r-xp 00000000 08:05 951388 /usr/lib/libstdc++.so.6.0.12
001f5000-001f9000 r--p 000e4000 08:05 951388 /usr/lib/libstdc++.so.6.0.12
001f9000-001fa000 rw-p 000e8000 08:05 951388 /usr/lib/libstdc++.so.6.0.12
001fa000-00201000 rw-p 00000000 00:00 0
00201000-00204000 r-xp 00000000 08:05 952830 /usr/lib/libplds4.so
00204000-00205000 r--p 00002000 08:05 952830 /usr/lib/libplds4.so
00205000-00206000 rw-p 00003000 08:05 952830 /usr/lib/libplds4.so
00206000-00209000 r-xp 00000000 08:05 950531 /usr/lib/libgmodule-2.0.so.0.2104.0
00209000-0020a000 r--p 00002000 08:05 950531 /usr/lib/libgmodule-2.0.so.0.2104.0
0020a000-0020b000 rw-p 00003000 08:05 950531 /usr/lib/libgmodule-2.0.so.0.2104.0
0020b000-0020d000 r-xp 00000000 08:05 2170925 /usr/lib/libXinerama.so.1.0.0
0020d000-0020e000 rw-p 00001000 08:05 2170925 /usr/lib/libXinerama.so.1.0.0
0020e000-00238000 r-xp 00000000 08:05 3923992 /lib/libgcc_s.so.1
00238000-00239000 r--p 00029000 08:05 3923992 /lib/libgcc_s.so.1
00239000-0023a000 rw-p 0002a000 08:05 3923992 /lib/libgcc_s.so.1
0023a000-00319000 r-xp 00000000 08:05 1279302 /usr/lib/xulrunner-1.9.1.2/libmozjs.so
00319000-0031b000 r--p 000df000 08:05 1279302 /usr/lib/xulrunner-1.9.1.2/libmozjs.so
0031b000-0031f000 rw-p 000e1000 08:05 1279302 /usr/lib/xulrunner-1.9.1.2/libmozjs.so
0031f000-00350000 r-xp 00000000 08:05 950424 /usr/lib/libssl3.so
00350000-00352000 r--p 00030000 08:05 950424 /usr/lib/libssl3.so
00352000-00353000 rw-p 00032000 08:05 950424 /usr/lib/libssl3.so
00353000-00369000 r-xp 00000000 08:05 951048 /usr/lib/libnssutil3.so
00369000-0036c000 r--p 00015000 08:05 951048 /usr/lib/libnssutil3.so
0036c000-0036d000 rw-p 00018000 08:05 951048 /usr/lib/libnssutil3.so
0036d000-00371000 r-xp 00000000 08:05 951726 /usr/lib/libgthread-2.0.so.0.2104.0
00371000-00372000 r--p 00003000 08:05 951726 /usr/lib/libgthread-2.0.so.0.2104.0
00372000-00373000 rw-p 00004000 08:05 951726 /usr/lib/libgthread-2.0.so.0.2104.0
00373000-00376000 r-xp 00000000 08:05 2187410 /usr/lib/libxcb-render-util.so.0.0.0
00376000-00377000 r--p 00002000 08:05 2187410 /usr/lib/libxcb-render-util.so.0.0.0
00377000-00378000 rw-p 00003000 08:05 2187410 /usr/lib/libxcb-render-util.so.0.0.0
00378000-0037a000 r-xp 00000000 08:05 2170911 /usr/lib/libXdamage.so.1.1.0
0037a000-0037b000 rw-p 00001000 08:05 2170911 /usr/lib/libXdamage.so.1.1.0
0037b000-00398000 r-xp 00000000 08:05 3924026 /lib/ld-2.10.1.so
00398000-00399000 r--p 0001c000 08:05 3924026 /lib/ld-2.10.1.so
00399000-0039a000 rw-p 0001d000 08:05 3924026 /lib/ld-2.10.1.so
0039a000-004eb000 r-xp 00000000 08:05 3940400 /lib/tls/i686/cmov/libc-2.10.1.so
004eb000-004ec000 ---p 00151000 08:05 3940400 /lib/tls/i686/cmov/libc-2.10.1.so
004ec000-004ee000 r--p 00151000 08:05 3940400 /lib/tls/i686/cmov/libc-2.10.1.so
004ee000-004ef000 rw-p 00153000 08:05 3940400 /lib/tls/i686/cmov/libc-2.10.1.so
004ef000-004f2000 rw-p 00000000 00:00 0
004f2000-004f9000 r-xp 00000000 08:05 952117 /usr/lib/libxcb-render.so.0.0.0
004f9000-004fa000 r--p 00007000 08:05 952117 /usr/lib/libxcb-render.so.0.0.0
004fa000-004fb000 rw-p 00008000 08:05 952117 /usr/lib/libxcb-render.so.0.0.0
004fb000-00521000 r-xp 00000000 08:05 950604 /usr/lib/libsmime3.so
00521000-00523000 r--p 00025000 08:05 950604 /usr/lib/libsmime3.so
00523000-00524000 rw-p 00027000 08:05 950604 /usr/lib/libsmime3.so
00524000-005a8000 r-xp 00000000 08:05 951876 /usr/lib/libcairo.so.2.10800.8
005a8000-005aa000 r--p 00083000 08:05 951876 /usr/lib/libcairo.so.2.10800.8
005aa000-005ab000 rw-p 00085000 08:05 951876 /usr/lib/libcairo.so.2.10800.8
005ab000-005bf000 r-xp 00000000 08:05 3924130 /lib/libz.so.1.2.3.3
005bf000-005c0000 r--p 00013000 08:05 3924130 /lib/libz.so.1.2.3.3
005c0000-005c1000 rw-p 00014000 08:05 3924130 /lib/libz.so.1.2.3.3
005c1000-005df000 r-xp 00000000 08:05 2171099 /usr/lib/libdbus-glib-1.so.2.1.0
005df000-005e0000 r--p 0001e000 08:05 2171099 /usr/lib/libdbus-glib-1.so.2.1.0
005e0000-005e1000 rw-p 0001f000 08:05 2171099 /usr/lib/libdbus-glib-1.so.2.1.0
005e1000-005e9000 r-xp 00000000 08:05 2187321 /usr/lib/libstartup-notification-1.so.0.0.0
005e9000-005ea000 r--p 00008000 08:05 2187321 /usr/lib/libstartup-notification-1.so.0.0.0
005ea000-005eb000 rw-p 00009000 08:05 2187321 /usr/lib/libstartup-notification-1.so.0.0.0
005eb000-005f3000 r-xp 00000000 08:05 2171197 /usr/lib/libfusion-1.2.so.0.7.0
005f3000-005f4000 r--p 00007000 08:05 2171197 /usr/lib/libfusion-1.2.so.0.7.0
005f4000-005f5000 rw-p 00008000 08:05 2171197 /usr/lib/libfusion-1.2.so.0.7.0
005f5000-005f7000 r-xp 00000000 08:05 951694 /usr/lib/libXcomposite.so.1.0.0
005f7000-005f8000 r--p 00001000 08:05 951694 /usr/lib/libXcomposite.so.1.0.0
005f8000-005f9000 rw-p 00002000 08:05 951694 /usr/lib/libXcomposite.so.1.0.0
005f9000-005fa000 rwxp 00000000 00:00 0
005fa000-006d6000 r-xp 00000000 08:05 951195 /usr/lib/libasound.so.2.0.0
006d6000-006da000 r--p 000db000 08:05 951195 /usr/lib/libasound.so.2.0.0
006da000-006db000 rw-p 000df000 08:05 951195 /usr/lib/libasound.so.2.0.0
006db000-006f6000 r-xp 00000000 08:05 950954 /usr/lib/libatk-1.0.so.0.2799.1
006f6000-006f7000 r--p 0001b000 08:05 950954 /usr/lib/libatk-1.0.so.0.2799.1
006f7000-006f8000 rw-p 0001c000 08:05 950954 /usr/lib/libatk-1.0.so.0.2799.1
006f8000-006fc000 r-xp 00000000 08:05 2170917 /usr/lib/libXfixes.so.3.1.0
006fc000-006fd000 r--p 00003000 08:05 2170917 /usr/lib/libXfixes.so.3.1.0
006fd000-006fe000 rw-p 00004000 08:05 2170917 /usr/lib/libXfixes.so.3.1.0
006fe000-006ff000 rwxp 00000000 00:00 0
006ff000-0072a000 r-xp 00000000 08:05 2171183 /usr/lib/libfontconfig.so.1.3.0
0072a000-0072b000 r--p 0002a000 08:05 2171183 /usr/lib/libfontconfig.so.1.3.0
0072b000-0072c000 rw-p 0002b000 08:05 2171183 /usr/lib/libfontconfig.so.1.3.0
0072c000-0076d000 r-xp 00000000 08:05 950573 /usr/lib/libhunspell-1.2.so.0.0.0
0076d000-0076e000 r--p 00040000 08:05 950573 /usr/lib/libhunspell-1.2.so.0.0.0
0076e000-00772000 rw-p 00041000 08:05 950573 /usr/lib/libhunspell-1.2.so.0.0.0
00772000-0078c000 r-xp 00000000 08:05 952852 /usr/lib/libgdk_pixbuf-2.0.so.0.1706.0
0078c000-0078d000 r--p 0001a000 08:05 952852 /usr/lib/libgdk_pixbuf-2.0.so.0.1706.0
0078d000-0078e000 rw-p 0001b000 08:05 952852 /usr/lib/libgdk_pixbuf-2.0.so.0.1706.0Aborted (core dumped)