Buggy, slow, not as good as the old dictionary extension before the quantum update.
Some more modern comment or forum section editors on sites like hearthpwn insert parts of the UI of this translator and bug out.

It's very useful an covenient

Very practical, pretty discreet, as it doesn't occur unless double-click on a word. Always suggesting right words.
Excellent to me.

мне нравиться!

Cool application!

Не нашел как перевести текст по двойному клику прямо на странице.

Yellow warning message in top, when I opened the Twitter page: An script in extension Mate Translate is slowing Firefox.

perfekt!! genau das was ich gesucht habe!!

This makes very great user experience.

Instabilité dans firefox nightly