Chime improves your time conciousness.
Chime reminds you that time passes. It speaks time at 15 mins interval (default).
Open extension option page and select your favorite language (English or Japanese is recommended but works for the others).
Requirements for Firefox on Linux
You need to install additional software to use text2speech feature of Firefox. for example,
sudo pacman -S speech-dispatcher festival festival-us yay -S festival-freebsoft-utils sudoedit /etc/speech-dispatcher/speechd.conf
Mentalist season 6 episode 17 "Silver Wings of Time" and FBI analyst Jason Wylie.