Ok, as you can see, aValue is -1 which is causing the code
IsNonwordChar(text[aOffset]))  to crash.  I applied the following patch
to 1.5.0.10-0ubuntu3 source in Feisty, then built with

export DEB_BUILD_OPTIONS="nostrip"
dpkg-buildpackage -b -nc -rfakeroot

causes the crash to disappear and smileys to be spellchecked...

** Attachment added: "check if aValue is negative"
   http://librarian.launchpad.net/7565069/thunder.diff

-- 
thunderbird smiley segfault
https://bugs.launchpad.net/bugs/56139
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