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.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjE3NDczNzYsIm5iZiI6MTcyMTc0NzA3NiwicGF0aCI6Ii85NTUzMDYvMzI5ODE2NjEzLThkMzQyYmM0LTM0M2EtNGNiYS04MzUzLWIwM2U5MTM3NTlkYS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQwNzIzJTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MDcyM1QxNTA0MzZaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1hNTIzY2JjYzA3MDMyMjk0MGEyYmM0NmE4NzA0ZTg1OGE0N2JlZmJjZGFhODlhZDg2Nzc4Yjk2OWU5NmY0MzEyJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCZhY3Rvcl9pZD0wJmtleV9pZD0wJnJlcG9faWQ9MCJ9.FRHQWyKMGf_Ameo87LiaMiZIQRH9s-3RYPu3WKwqDSY)
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)