karma-browserify streamlines testing JavaScript code processed by Browserify within the Karma test runner. It acts as a preprocessor, automatically bundling your modules using Browserify before sending them to the browser for testing. This simplifies your workflow, allowing you to leverage Browserify's features like require() and npm modules in your tests seamlessly. Forget manual bundling steps; karma-browserify handles the complexities, making testing modular code efficient and straightforward. It improves developer productivity by integrating Browserify directly into your Karma testing environment.