Here's a list of the useful chrome extensions for web developers
JSON Formatter is an extension that parses the JSON beautifully before outputting it in the browser.
Octotree is a Github helper. It allows you to switch between files and folders quickly in your repositories. It saves a lot of time and effort.
User Javascript and CSS is quite a productive tool for me. It allows you to add custom CSS and Js to any website.
I've used to hide Facebook Newsfeed and story section with this extension
Wappalyzer is a technology profiler that shows you what websites are built with. It shows you which technologies is website using.
