Rated 5 out of 5 stars

Very useful add-on. Mozilla should include this kind of feature by default in their apps.

However, I just found a bug which affected to version 0.8.1 (at least on Firefox 3). It caused weird effects on the size and style of page texts. I realized that it only happened when it was unable to set a language automatically.

I'm using the version 0.9 now (download on the official website of Dao), and it seems to have that bug fixed. Good work ;) .

This review is for a previous version of the add-on (0.9).