Much improved version Rated 4 out of 5 stars
From the first view I have to say wow! Version 2.4 has pretty much everything you missed in the first simple version.
All the new features work quite well. The points I criticised before (FF 4 compatibility and multi-language) are fixed. Also the inline translation is a great enhancement.
Though as with all big changes there are still some little flaws like not being able to select the languages in the options after hitting "Refresh", an incorrectly aligned inline translation and some others. That's why I just give four of five stars, but all in all a great improvement!
Simple to use, but missing options Rated 3 out of 5 stars
Since dict.cc is the first place for me for searching a translation, this add-on was the right choice for me.
Though there are two problems I want to point out:
1. The extension is not compatible to current versions of Firefox (3.6 and 3.7 pre-alpha; though it was working fine for me when deactivating the version check)
2. dict.cc is already offering translations into different languages than just EN DE for some time. So it would be nice to have the possibility to select the translation languages (from and to).