Just how to get rid of Calendar/Tasks switches from Thunderbird: linux

If, like me, you do not require the Calendar/Tasks capability of Thunderbird as well as intend to do away with the switches in the title bar as well as the condition bar, duplicate this userChrome.css to a “chrome” subdir in your account directory site (~/. thunderbird on Linux) as well as established the toolkit.legacyUserProfileCustomizations.stylesheets choice to real in the Configuration Editor.