rikaikun is a browser add-on designed to assist users in understanding Japanese texts by providing instant translations and English definitions. Developed by Erek Speed, this free add-on is available for the Chrome platform.

With rikaikun, users can easily look up the meanings of Japanese words without interrupting their reading flow. Whether you are a Japanese learner or a native speaker looking for English translations, this add-on has got you covered. It offers a seamless experience by showing the translations when you hover over Japanese text in your browser.

The add-on comes with several useful features to enhance your Japanese learning journey. You can switch between word, names, and Kanji dictionaries by using the shift or enter keys. Additionally, you have the option to enable text-to-speech functionality to hear the Japanese words spoken aloud. Need to create flashcards? Simply press 'c' to copy the current word and definitions to the clipboard.

Customization options are also available, allowing you to personalize the appearance and content of the pop-up dictionary. Activate the extension by clicking the 理 icon in the top right corner, and you're ready to explore the world of Japanese texts with ease.

Please note that rikaikun's changelog can be found on their GitHub page for detailed information on updates and improvements.