[ubiquity] Block pesky browser plugins (flash etc)

Inspired by the greasemonkey script here.

CmdUtils.CreateCommand({
    name: "block-plugins",
    execute: function(input) {
        var document = context.focusedWindow.document;

        e = document.evaluate("//embed", document, null, 6, null);
        for (i = 0; i < e.snapshotLength; i++) {
            var object = e.snapshotItem(i);
            object.parentNode.removeChild(object);
        }

        e = document.evaluate("//object", document, null, 6, null);
        for (i = 0; i < e.snapshotLength; i++) {
            var object = e.snapshotItem(i);
            object.parentNode.removeChild(object);
        }
    }
});