مقيمة بـ 1 من 5 نجوم

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.

هذا التعليق كان على إصدارة سابقة من هذه الإضافة (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.