"Kitty Keys" is a browser extension that lets you hear a cat barking when you hit a specific key on your keyboard. Compatible with Google Chrome and Firefox.
After installing from the site, if you enter characters in the browser such as Gmail or site search, you will occasionally hear a cute cat barking like "meow".
There are four keys that produce sound: M, E, O, and W. The loudness and height of each bark are different. If you forget to put it in and suddenly make a cry, you will be quite surprised, so it may be good for drowsiness. By the way, the sound can be turned on / off by clicking the cat icon on the menu bar.
M ・ E ・ O ・ W is MEOW, that is, the bark of a cat. If it goes well, you may see something interesting.