A bookmarklet for "selecting all" (technically, "toggling all") checkboxes on the Amazon AWS S3 console.

bookmarklet.js

javascript:(function () {
    document.domain = 'console.aws.amazon.com';
    var spans = document.querySelector('iframe').contentDocument.querySelectorAll('tr.list-view-item[type] span.inner');
    [].slice.call(spans).forEach(function (span) {
        span.click();
    });
})();