AnchorTab: Focus Assist от Ferdinand B. Alexander

AnchorTab (formerly SpotMe) is a productivity extension that helps you stay focused while browsing. Set a countdown timer for your current tab or tab group, and AnchorTab will gently guide you back if you try to leave before your session ends. The stopwatch feature helps, track specific work activities, and allows you export your time sheet. With a modern, easy-to-use interface and automatic reminders, AnchorTab is perfect for deep work, study sessions, or anyone who wants to minimize distractions and maintain concentration online.