Configure Gnome Shell Extensions (Themes) with gsettings

Get all current Gnome Shell extensions settings:

gsettings list-recursively |grep "org.gnome.shell.extensions"

Example output:

org.gnome.shell.extensions.alternate-tab behaviour 'all_thumbnails'
org.gnome.shell.extensions.alternate-tab first-time false
org.gnome.shell.extensions.dock autohide true
org.gnome.shell.extensions.dock hide-effect 'resize'
org.gnome.shell.extensions.dock hide-effect-duration 0.29999999999999999
org.gnome.shell.extensions.dock position 'left'
org.gnome.shell.extensions.dock size 48
org.gnome.shell.extensions.auto-move-windows application-list @as []
org.gnome.shell.extensions.native-window-placement strategy 'natural'
org.gnome.shell.extensions.native-window-placement use-more-screen true
org.gnome.shell.extensions.native-window-placement window-captions-on-top true
org.gnome.shell.extensions.icon-manager desaturation-factor 1.0
org.gnome.shell.extensions.icon-manager top-bar @as []
org.gnome.shell.extensions.user-theme name ''

Modify settings with following command:

gsettings set org.gnome.shell.extensions.[name] [key] [value]

Example

gsettings set org.gnome.shell.extensions.dock size 60