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As far as just a single letter calls the function, it's useless. But I really hope tto see it fixed soon, it has great potential.

Это отзыв для предыдущей версии этого дополнения (1.4.1). 

Are you using Firefox 2 or Thunderbird 2 on Mac OS X? Otherwise, a single letter calls the function if and only if you selected text previously.