Mturk Suite Firefox [best] -

This module maintains a personal database of your work history, including HITs you have submitted, returned, or completed. It helps you avoid retaking surveys you’ve already finished and keeps a running total of your projected earnings.

Once you find a HIT you want—especially high-demand ones that disappear quickly— HIT Catcher can be set to automatically attempt to "catch" or accept it for you. mturk suite firefox

Scans the MTurk marketplace for new tasks based on user-defined filters. HIT Catcher: This module maintains a personal database of your