You will need to install a user script manager extension to install this script.
This script is for mturk.com.
When a HIT has been accepted, this script scrolls the mturk workspace to the top of the window. When a HIT is being previewed, this script scrolls the 'Accept HIT' button to the top of the window, unless there is a CAPTCHA. Whenever a HIT is previewed or accepted, this script sets the iframe height equal to the browser's viewport height to ensure proper scrolling and gives focus to the iframe.
This script works best if it is executed after mmmturkeybacon Butt-in Buttons and mmmturkeybacon Enhanced HIT Information Capsule.