Dark theme switches the Gmail webpage to dark mode. Use a dark reader or change the screen brightness to protect your eyes.
Honestly the best one I've found that I can actually read the emails with
the only extension that makes a normal contrast between read and unread messages
https://dark-shiftmode.com/
Dark Theme Web
https://darkpages.net/
https://darkreader.net/
Wayne Price
https://nighteye.app
https://nightmodetech.com
https://nighteye.app
https://midnightmode.net
https://darktheme.app
https://darkreader.org/
https://darkmodepro.com
