This script attaches a stopwatch into the toolbar of Leetcode's problem page.
![image](https://private-user-images.githubusercontent.com/955306/329816613-8d342bc4-343a-4cba-8353-b03e913759da.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjE3NDE0MzAsIm5iZiI6MTcyMTc0MTEzMCwicGF0aCI6Ii85NTUzMDYvMzI5ODE2NjEzLThkMzQyYmM0LTM0M2EtNGNiYS04MzUzLWIwM2U5MTM3NTlkYS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQwNzIzJTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MDcyM1QxMzI1MzBaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT02ZjhjYjViZTIxZmM3OWIxYWMwNzFhZTc0MTY5MjBhYjA1YThjOTc5YzkwZDBlMTA3YTA1MzkxYWVkODY4MTcyJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCZhY3Rvcl9pZD0wJmtleV9pZD0wJnJlcG9faWQ9MCJ9.q69r2KJdje-yA5-bF7yKrTG4W6rUcfQNOqp0SnFRDx4)
The feature is simple:
- Start/Stop the stopwatch
- Auto start after 2 mins remaining on the problem
- Restore unstopped stopwatch for the next visit on the problem
Use this script with any browser extension allowing attaching JS to the page. (I use User JavaScript and CSS)