Browser dev tools offer powerful debugging capabilities for JavaScript, allowing developers to identify and fix issues in their code efficiently. Here are some essential features to help you debug your JavaScript:

1. Setting Breakpoints: A breakpoint is a designated point in your code where execution stops, allowing you to inspect variables, step through the code, and identify the source of the problem. To set a breakpoint, simply click on the line number in the source code panel of the dev tools.

2. Stepping Through Code: Once a breakpoint is set, you can start stepping through the code line by line. Use the next/step into (F10) and step over (F11) buttons to navigate through the code and observe the changes in variables and their values.

3. Monitoring Variables: The dev tools provide a console where you can log variables and view their values. To add a log, use the console.log() method and check the console tab in the dev tools for the logged output.

With these debugging features, you can pinpoint and fix errors in your JavaScript code, making your web applications more reliable and efficient.