I have no extensions other than Lightning 2.6.4 added to Thunderbird 24.4.0. The Appearance is: Defa

I have no extensions other than Lightning 2.6.4 added to Thunderbird 24.4.0.

The Appearance is: Default 24.4.0

The Dictionaries are: United States English Spellchecker 7.0.1

And, the Plugins are listed in the attached image.