Here is a list of my favorite chrome extensions that I use on a daily basis for various development tasks:
Chrome extension for printing JSON and JSONP nicely when you visit it ‘directly’ in a browser tab.
Beautifies your var_dumps and makes them easier for humans to comprehend. No pre tags and no libraries needed!
Extending Developer Tools with a new panel providing all kinds of information useful for debugging and profiling your PHP scripts, including information on request, headers, GET and POST data, cookies, session data, database queries, routes, visualisation of application runtime and more.
To see a video of this with Laravel check out Laracasts
Provides Chrome browser integration for the official LiveReload apps (Mac & Windows) and third-parties like guard-livereload and yeoman.
Did I miss your favorite? Share in the comments.