It seems good and promising!
Interestingly, you can directly write your own text and do instant translation, a feature not usually found in similar add-ons.
However, the UI need some improvements, most important of them being:
- make the translation window movable (drag & move)
- make translation window sizable or auto-sizable, i.e. to automatically adapt to the content.
- add option to show-up just the translated text and selectively hide all or some of the other elements like buttons, drop-down language lists et.c.