:~/$ thunderbird
DOUBLE-CLICK: 250 --> -1 THRESHOLD: 8 --> -1 Error: Cairo does not yet support 
the requested image format:
        Depth: 8
        Alpha mask: 0x00000000
        Red   mask: 0x00000007
        Green mask: 0x00000038
        Blue  mask: 0x000000c0
Please file an enhacement request (quoting the above) at:
http://bugs.freedesktop.org/enter_bug.cgi?product=cairo
thunderbird-bin: /home/dajobe/dev/debian/cairo/cairo-1.2.2/src/cairo-image-
surface.c:155: _cairo_format_from_pixman_format: Zusicherung »NOT_REACHED« 
nicht erfüllt.
/usr/lib/thunderbird/run-mozilla.sh: line 131:  6698 Abgebrochen             
"$prog" ${1+"$@"}

:~/$ thunderbird -V
 Mozilla-Thunderbird 1.5.0.4, Copyright (c) 2005 mozilla.org