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About this Add-on
We know this tool doesn't always work properly, and we are looking at when and why. It does however work for many grids — perhaps all of the simple ones. Please help out by reporting problems and making requests. We are limited in what we can do in this Extension, but many of the ideas being tested in this little project are informing more powerful tools for the future. Plus, for many of us working to understand Grid, this tool has been incredibly helpful, even with its limitations. We hope it's helpful for you, too.
This tool works only in Firefox. If you download and use Firefox Nightly, you'll have the most-complete implementation of CSS Grid, and you don't have to flip a flag to make it work. It will Just Work™.
This add-on is not compatible with your version of Firefox because of the following: