The extension helps you read articles in the language that you want to practice and offers one-click translation and pronunciation.
https://iteach.world
Maiko.M
Fiszkoteka.pl
http://www.wordgram.co/
https://lingvomind.com/
Shavavo
Patrick
nikitph
https://vocapouch.com
Monwara
https://vocabtracker.com
http://www.memslate.com/