Power-drag is simply cool. Probably I should call it "awesome script"? Pressing your shift key then hover textareas, select boxes, iframes, objects, images or input fields to simply resize them by dragging its lower right corner. Simple, clean and efficient. Double click to restore the original dimensions. You can enable the dragging corner always, or use another modifier key. The script requires shift by default because makes the script less intrusive, and does not cover small elements in the page, while having a smaller performance impact.
original author: João Eiras