This addon will display how many times in a row you've rolled without success for bonus loot. It displays automatically when a boss encounter ends (but not for world bosses). The slash commands /br or /bonusroll will also show this number. This is usefull since the chance to loot grows with each failed roll ; you might want to hold your roll for something you really want, when the chance gets high. Did Blizzard say it's almost a guaranteed loot after 7 failed rolls ?