If you are on Prolific or considering, and on Chrome or considering it, definitely check out the Prolific Assistant extension from Kadauchi. (How do I link his username?) I was previously using the Distill Monitor in Firefox, but this tool is better, on the whole, as it is designed explicitly for Prolific. It is slightly less obtrusive, especially if you are on mturk. It has a pop-up like Panda Crazy when you catch something, but you still need to go to Prolific to get it. That is the main drawback, and I have had some frustration, but I think it is still the best thing for Prolific. Thanks to Kadauchi.