Short JS snippet for changing all descriptions on a Flickr mass edit page.

flickr-mass-description.js

function changeDescriptions(text) {
  var elements = document.getElementsByClassName('together_description');
  for (var j = 0; j < 2; j++) {
    // Do this twice because Flickr needs it (probably 2 x keyup events)
    for (var i = 0; i < elements.length; i++) {
      var event = new Event('keyup');
      elements[i].dispatchEvent(event);
      elements[i].value = text;
    }
  }
    
  var next_button = document.evaluate('//input[@value="SAVE AND GO TO NEXT PAGE"]', document).iterateNext();
  if (next_button) {
    next_button.click()
  } else {
    document.evaluate('//input[@value="SAVE AND BE DONE"]', document).iterateNext().click();
  }
}

var text = 'Photography by Suzie from <a href="http://countrypix.com.au" rel="nofollow">Country Pix Photography</a>.';
changeDescriptions(text);