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Here are some of my favorite Google Chrome Extensions for Responsive Design:

Emmet Re:view
https://chrome.google.com/webstore/detail/emmet-review/epejoicbhllgiimigokgjdoijnpaphdp

Breakpoint media-queries
https://chrome.google.com/webstore/detail/breakpoint-media-queries/lgldclhgkdgddiopgbjkiememjlhjlng

Resolution Test
https://chrome.google.com/webstore/detail/resolution-test/idhfcdbheobinplaamokffboaccidbal

NOTE: Got a favorite you'd like to share? Post in the comments. Thanks!