This addon changes your loot spec automatically when fighting bosses. If you want to get healer loot off of one boss and tank loot off of another, you can set your preference in the dungeon journal. The addon will switch your loot spec automatically when you target those bosses.
Open the Dungeon Journal, select a boss, and click the top button to select which loot spec you want to be set to for that boss. The bottom button is where you can set your preferred default loot spec. The default loot spec is used by the addon to determine what loot spec it should switch to after looting a specific boss has completed.
By default, the addon treats all difficulties the same. If you want it to keep a separate list for every difficulty, type /lss diff to enable per-difficulty settings. Type the same command again to disable per-difficulty settings.
Other available commands:
/lss onoff: Enable or disable the entire addon
/lss quiet: Enable or disable chat output when the addon changes your loot spec
/lss list: List your current loot spec preferences
/lss diff: Toggle the option for per-difficulty spec choices
/lss record: Set your current loot spec as the preferred loot spec for the current raid target
/lss setdefault: Toggle the option for the addon to switch to your default spec after looting
/lss setdefaulttofollow: Set your current loot spec as the preferred default loot spec
/lss forget: Forget the preferred loot spec for the current raid target
/lss forgetdefault: Forget the preferred default loot spec