5점중 1점 받음

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.

이 검토는 현재 부가 기능의 이전 (1.4.1) 버전에 대한 것입니다. 

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.