In case this addon breaks your CVARs upon removal, you can use the following commands to restore back to default:
/console floatingCombatTextCombatDamage_v2 1
/console floatingCombatTextCombatHealing_v2 1
/console floatingCombatTextCombatLogPeriodicSpells_v2 1
/console floatingCombatTextPetMeleeDamage_v2 1
/console floatingCombatTextPetSpellDamage_v2 1
MSBT is designed to be an extremely lightweight, efficient, and highly configurable mod that makes it easier to see combat information by scrolling the information on the screen in separate, dynamically creatable scroll areas. It is a replacement for Blizzard's Floating Combat Text and Damage output.
If you're rich person :D and 1€ isnt much for you, i would appreciate the support :D

