This addon fixes the default Blizzard healthbars and improves party frames.
You can setup your preferences under the addon options menu or by typing /simplehealth
You can discuss or report bug of this addon on this Discord server:
https://discord.gg/5hBQhsBfy7
NOTE:
Players health will only show 100 out of your party or raid.
Player health was only added in WOTLK. (Patch 3.0.2 / API changes (2008-10-14): Units outside your own party or raid now show genuine health (not just a fraction of 100) )