This plugin is outdated and might not be supported anymore
Details
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Similar functionality has been developed for the Theme Customizer API and was merged into WordPress core as of version 4.5. This plugin will automatically deactivate when you install WordPress 4.5.

When viewing the front end of the site, a “Responsive” button is added to the WordPress Toolbar. Clicking that will toggle an overlay with your website presented in various sizes for easy responsive design testing.

This can be useful both during theme development, and when writing content to verify it will be presented properly.

This plugin is a heavily modified version of Matt Kersley’s Responsive Design Testing.

Details

Plugin code:
responsive-page-tester
Plugin version:
3.0
Outdated:
Yes
WP version:
3.1 or higher
PHP version:
or higher
Test up to WP version:
4.4.33
Total installations:
20
Last updated:
2016-03-28
Rating:
Times rated:
10
design
layout
mobile
responsive
test