Powerful New Additions to the CSS Grid Inspector in Firefox Nightly

CSS Grid is revolutionizing web design. It’s a flexible, simple design standard that can be used across all browsers and devices. That’s why we built CSS Grid Inspector. We’ve been working hard on the Firefox Developer Tools Layout panel, adding powerful new features to the Grid Inspector and Box Model. The latest enhancements are now available in Firefox Nightly.

Link: https://hacks.mozilla.org/2017/06/new-css-grid-layout-panel-in-firefox-nightly/