Enable dark mode on Google Chrome under Linux (GNOME environment).

google-chrome-dark-mode-linux-gnome.md

Enable dark mode on Google Chrome under Linux (GNOME environment)

1. Create a new google-chrome.desktop file using Chrome's default:

   cp /usr/share/applications/google-chrome.desktop ~/.local/share/applications/google-chrome.desktop

2. Edit the google-chrome.desktop file that was just created:

   gedit ~/.local/share/applications/google-chrome.desktop

3. Search for Exec and append --enable-features=WebUIDarkMode --force-dark-mode to the end of the line each time it appears (about 3 times):

   # before
   Exec=/usr/bin/google-chrome-stable %U
   
   # after
   Exec=/usr/bin/google-chrome-stable %U --enable-features=WebUIDarkMode --force-dark-mode

4. (Optional) You can set Chrome's Settings > Appearance > Theme to use Classic instead of GTK+. It looks better in my opinion.

5. Restart Chrome.

Glossary

.desktop: A shortcut to an application that will appear when searching applications. Contains config information on how the shortcut will look and how to launch the application. Any exectable can have a GUI shortcut by adding a .desktop file to ~/.local/share/applications/.

Exec: The actual CLI command that launchs the application executable. Command line options can be added here.

Credits

This guide was adapted from Chris Hayes' answer.