Seamonkey becomes unstable with Enigmail

Binary package hint: enigmail

Seamonkey suite's Mail is known for not supporting OpenPGP encryption out of the box.
For this reason, an add-on called Enigmail was once created, it brings PGP features for
mail signing and decrypting. Once installed, though, Enigmail of recent version (0.97a
at the moment) will make the suite unstable, generally the Mail and Newsgroups. The
PGP functionality is present and works though writing a memo may and will most likely
produce a crash of a whole suite incl. browser with all open windows etc. The information
is unsaved. Disabling the add-on works like a charm though I guess there should be a
better solution. The bug is not to be called trivial because launchpad collaboration includes
working with PGP-secured mail.

The Enigmail add-on website:
http://enigmail.mozdev.org/