Responsive design tester is a responsive design tester extension for chrome. also, it is design extension. it's a free extension , it has 4,000+ active users since released its first version, it earns an average rating of 3.50 from 8 rated user, last update is 2838 days ago.
**THERE ARE 2 ISSUES REPORTED. "Chrome CRASH" ** Responsive design tester is used to test responsive web site design. this plugin inspired from https://chrome.google.com/webstore/detail/mobileresponsive-web-desi/elmekokodcohlommfikpmojheggnbelo
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It is good one which I am using from long time
Good Application for checking responsiveness. great idea was Developer love from India