Adds a calque to foreign-language web-pages to aid language learning.
I tried a lot of similar extensions and this one is the best. It combines functionality and simplicity well. Also, if you are bothered with all words being red, you can make the red highlighting invisible in the options. Edit: The only downside of it is that it only accepts single words and not phrases.
good
I use this extension with IM Translator and Dict.cc for definitions. Then I can reread foreign-language articles and have an instantaneous translation of words I've forgotten.
rememberry
aided reading
saurav.1869
https://www.etymonline.com
https://vocabtracker.com
https://vocapouch.com
W9G
Monwara
Cee68
https://readlang.com
dobladov
https://www.memslate.com