Chameleon
Simple responsive website testing.
What is Chameleon?
Chameleon is a Chrome extension designed to enable quick review of your web app's responsiveness on various screen sizes. Simultaneously see the behavior of your site on different sizes and configurations. Chameleon opens your site in a new tab for testing in both portrait and landscape orientations of each device. Users can add and adjust as many viewports and devices as needed. Source code available on Github.

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Summary
Chameleon lets you quickly view the responsiveness of your web app in multiple device viewports.
Simultaneously review your site's behavior on a myriad of different screen sizes.
For testing, Chameleon opens your site in a new tab and shows you both the portrait and landscape orientation of each device.
Add and configure as many viewports and devices as you need.
View the source code on Github: http://stefanritter.com/chameleon/
User reviews
User reviews summary
Pros
- Easy to use
- Very useful
- Aids in video downloading
Cons
- Issues when adding a new device
- Needs more pre-configured devices or break-points
Most mentioned
- Useful
- Device addition problem
Safety
Risk impact
Chameleon is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this extension. Review carefully before installing. We recommend that you only install Chameleon if you trust the publisher.
Risk likelihood
Chameleon has earned a good reputation and can be trusted.
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