Very very very very useful! Duolingo becomes better at teaching me words, as I try to remember and use again all the alternative words and wording! I recommend it.

Without this addon Duo has a huge bug: it does not always tell you when your answer is wrong. I learned words wrong several times before I discovered this Addon. Thank you so much! This is a must-have for Duo users.

Считаю полезно, расширяет возможности сайт.