It seems that there is an incompatibility between Thunderbird 3.0.5 and libmoon0 2.2-3.2-x86_64.
On thunderbird run i got a error like:
Code:
Attempting to load the system libmoon 
/usr/bin/thunderbird: line 130:  9564 Segmentation fault      $MOZ_PROGRAM "$@"
After removal of libmoon everything is ok with thunderbird.

System: openSUSE 11.3 - 2.6.34-12-desktop - x64