New features, changes and fixes in Version 5.0:
• New: Day Colors tab in Options dialog to customize colors for Today and Selected Day styles.
• New: Color pickers for Today and Selected Day header background, day box background and border color.
• New: Option to apply border color to Today header and day box in all of the main calendar views.
• New: Option to apply border colors to Today and Selected Day day boxes in Mini-month panel.
• New: Buttons to restore colors and border settings for Calendar Tweaks and Lightning 2.* default styles.
• New: Added Calendar Tweaks Options... menu item in Thunderbird Tools sub-menu.
• New: Added Apply button in Options dialog to apply setting changes without exiting.
• Chg: Changed Set lighter shading... option to become Set more distinct shading... option.
• Chg: Updated language translations (will need further updating) and added Spanish translation.
• Chg: Updated to be compatible with Thunderbird 27.* and Lightning 2.9.*.
See complete version history