Aere Greenway had posted here ( https://lists.ubuntu.com/archives/lubuntu-users/2012-December/003153.html) about how menu items disappear not just in T'bird but also Audacity:
"Yesterday, in using the "Audicity" application (an audio recorder/editor), > I specified a change in "edit...preferences", and on hitting the "OK" > button to make the change, almost all of the menu bar disappeared (only the > first few letters of the "File" menu remained)." > I can reproduce this with Audacity 2.0.1 on Lubuntu 12.10. After making a change in Edit, Preferences, all the menu items other than "File" disappear and only "Fil" of "File" remains.
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