Pick a date. From then on every new tab shows what is left of it — weeks, days, hours, down to seconds if you are feeling dramatic. This is the widget the whole extension grew out of.

A countdown in an app has to be opened. This one does not. It turns up every time you reach for a distraction — which, let us be honest, is exactly when you need reminding.
People point it two ways and both work. At the thing they dread: finals, the thesis, the release. Or at the thing they want: the trip, the birthday, the last day of term. Same widget, opposite feelings.
Seconds on a six-month countdown are noise. Hours hidden on a same-day deadline are useless. So all eight units — years down to milliseconds — are separate switches, and you keep only the ones that tell you something.
Drop the rest and the widget shrinks to fit. No empty zeroes hogging the page.
One-off dates expire. Stand-ups, gym days and monthly invoices do not. Switch on repeat and the countdown rolls to the next occurrence instead of sitting at zero looking sorry for itself.
Monthly and yearly are free. Daily, weekly and fortnightly are PRO — those are the ones that turn a date tracker into a standing reminder.
Skip the date picker and tap a holiday instead — Halloween, Diwali, Thanksgiving, Black Friday, Christmas. The widget finds the next one and does it again next year. Set once, forget forever.
Then there is the working-days switch. Turn it on and weekends stop counting. A deadline three weeks out loses six days, which is unpleasant and almost always the number you actually needed.
Font, size, colour, background, shadow, corners — the usual panel. Transparent background puts the digits straight onto your wallpaper; a translucent one makes a card. Lobster over a photo is where half the gallery has landed, and it is hard to argue with.
Position is stored relative to the page, so plugging in a second monitor does not scatter your layout.
The countdown widget is part of New Tab Studio — free to install, no account needed to start.
Add to ChromeThree, if you are adding them yourself. Widgets that come with an installed theme do not count at all — so a ready-made page with five countdowns is free. Only building from scratch hits the limit.
A one-off countdown stops at zero and stays there until you change the date — it does not go negative, and there is no sound or notification. A repeating countdown recalculates straight to the next occurrence.
The countdown is computed from the target date every time the page renders, so there is nothing to keep running. Close the browser for a week and it will be correct when you come back.
Yes — publish the page as a theme and anyone who opens the link gets your layout, wallpaper and target date in one click.