Simple Time Tracker Installed

Click the puzzle piece (1) in the top right of your browser. Then, click the little pin (2) next to the extension:

Open the extension (3) on any page to start tracking a task. To see where your time went, click Reports (4):

The report opens in a new tab and covers the last 7 days: hours by day broken down by task, totals for each task, and a log of every session with a button to continue it in one click.