Much better than the Chrome version. Firefox baby!

exactly what I was looking for

Juan Escobar your app is awesome and deserve 6/5 stars! 💖 💯
The user interface is very well done, very user friendly, simple looking, EXCELLENT!
I read some comments asking for more options or using the mouse wheel, do not bother and please don't change the UI as it is just PERFECT as it is right now. 👍

Your addon works like a charm!
Thanks a lot for your hard work, you rock 🏆

Would be awesome to highlight a text & then use the mousewheel button to get immediate translation, like the Babylon translator way back in the old days, if someone even knows or remembers that.
Also make it possible in the options to assign another button or key & to switch to translate, read or full page translate.