Lightweight addon tweaking default Blizzard UI + adding some features.
Options:
Turn on ClassColors on UnitFrames
Turn on Outline on Nameplates
Turn on Combat Indicator to Player/Target/Focus Frame
Turn on Class Icons on Target/Focus Frame
Remove background behind player/focus names
Remove Prestige Icons from Player/Target/Focus Frame
Remove glowing golden effect on PlayerFrame while in rested area
Remove "zzZ" effect on PlayerFrame while in rested area
Remove red flash around Player while in combat (melee)
Remove portrait corner icon (small arrow in PlayerFrame)
Change frame color of UnitFrames to your preference
Automatically collapse quest tracker when entering battleground
All of those settings are turned off by default.
To turn specific options on go to interface --> KrioUI addon
List of features can be enhanced in future.
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PROMO ON MY WEAK AURA (designed for PVP, useful in PvE as well)