ExtraActionButton1

The ExtraActionButton1 is a UI element that appears during certain boss fights and quests that gives the player access to special fight-specific or quest-specific powers.
This UI element is mildly notorious because it is not handled properly by some UI replacement add-ons, robbing users of the ability, often with fatal results. The most common workaround is the following macro:
 /click ExtraActionButton1
although it is also possible to bind it to a key through the standard key bindings.
== Quests and boss encounters ==
* Ultraxion (Dragon Soul)
* Madness of Deathwing (Dragon Soul)
* Weed War 1 and II (Valley of the Four Winds)
* Dread Wastes (players who have progressed far enough along the quest chain gain a Klaxxi Enhancement)
* Corrupted Taran Zhu (Shado-Pan Monastery)
* Feng the Accursed (Mogu'shan Vaults)
* Wind Lord Mel'jarak (Heart of Fear)
* Ji-Kun (Throne of Thunder)
* Anthracite (Brawler's Guild)
==Patches and hotfixes==
*