Open multiple windows by Mass Action on selected table rows (Using window.open)

If you use a Snippet like this for your Mass Action it should do the trick:

skuid.$.each(arguments[0].list.getSelectedItems(),function(i,item){
    window.open(‘/apex/skuid__UI?page=SomeOtherPage&id=’ + item.row.Id);
});

You’re a brain with legs

I do have legs

Shouldn’t we be able to do this with a Redirect to URL action in the action framework, as long as the target is _blank?

Mass action should run once for each selected item… ?

Yep! A better option indeed.