I only have one must-have add-on or extension in my browser. That is ImTranslator. Yeah, I really need it because in my daily interaction with the internet I have to use English. English is not my first language, so I have to learn more especially about vocab. This add-on makes me easier to translate English words or phrases to Indonesian (my first language). So it helps me to understand the meaning of the text or article easily.
To use this add-on, you just block the words you want to translate, then in the upside will appear the bubble icon. If you click it, then it will automatically show the translation window. Very easy right?