Puts the timer, or "remaining time", in the titlebar. Or rather, it replaces the titlebar with just the remaining time. You won't see "Amazon Mechanical Turk" mentioned in the titlebar. This should provide adequate space for those whose tabs act as a titlebar.
Please leave feedback if the @match isn't specific enough.
v1.1.20180123 - Website changed; countdown-timer to completion-timer v1.2.20180124 - Another website change; countdown timer was changed to duration; script will continue showing the countdown in the titlebar or tab title (hasn't been tested for multi-day timers) v1.2.20180210 - Fixed multi-day issue v1.3.20180405 - Prepends countdown timer before page title. Website Changes.