Another useful extension is the Resolution Test that changes the size of the browser window, so web developers can preview websites in different screen resolutions. It also includes a list of commonly used resolutions, as well as a custom option to input your own resolution.
With the Web Developer extension, you can access additional developer tools such as validation options, page resizing and a CSS elements viewer; all from an additional button in the toolbar.
Another extension you should check out is the Chrome Editor that allows you to easily code within your browser, so you don’t have to flip between your browser and code editor. You can also save a code reference locally to your computer for later use.
These are just a few of the extensions you can find in Chrome extensions for web development page. You can also look for more in the extensions gallery.