mmmturkeybacon Preview OverlayJS
Covers a HIT's workspace with a gray overlay if the HIT has not been accepted. Clicking once on the overlay will remove the gray foreground and allow you to interact with the HIT's contents while still showing a message warning you the hit has not been accepted.
CH Reload Frame ButtonJS
Adds a reload button on pages loaded in an iframe/frame. For more convenient access than the right-click menu, or for browser versions which don't have that menu command. Also shows the frame's URL in the button's mouseover text.