Rosetta

Tired of copying text, opening a new tab, and pasting into Google Translate? Rosetta cuts all of that out. Simply highlight any text on any webpage and an instant translation popup appears right next to your cursor — no new tabs, no copy-pasting, no interrupting your reading flow.

Rosetta works on any website and automatically detects the language, with special optimization for Japanese including hiragana, katakana, and kanji. Toggle it on and off instantly with Alt+T so it's never in the way when you don't need it. Lightweight, free, and no account required.