Remove Specific item which occurs number of times in an Array

var firstArray=[5,5,3,5,8,5,9,5,4,5,9,5];
    for(var i=0;i<=firstArray.length;i++){
         if(firstArray.indexOf(5)!=-1){
            firstArray.splice(firstArray.indexOf(5),1);
            }
    }
    gs.info(firstArray);