Stylesheet for thunderbird dinosaurs on supernova
Note that new thunderbird updates may break the ui changes
Enable menu bar, classic view, hide folder pane header, and set density to compact
In the config editor, set toolkit.legacyUserProfileCustomizations.stylesheets to true
Find profile directory via troubleshooting information
Create chrome folder and place userChrome.css
Customise toobar buttons and search box placement. Arrange message list columns.