MobInfo collects data whenever you fight a Mob. It starts off with an empty database, which fills up automatically the more you fight and play. The data it collects is used for enhancing the game tooltip and the game target frame. It is also made available to other AddOns (mostly the mob/target health values). The amount of data that gets recorded is configurable through the MobInfo options dialog.
New Feature: It is now possible to show the vendor sell value of an item in the item tooltip (Disabled initially, enable in MobInfo 'Tooltip' options).
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When you Download MobInfounzip it in WoW Interface Folder (Example: C:\Program Files\World of Warcraft\Interface\AddOns) Read more on this article...