Helps you explore the distribution of DOM nodes in the document tree.
What is DOM Treemap?
DOM Treemap is a Firefox add-on that helps you explore the distribution of DOM nodes in the document tree. With an additional pane in your Devtools Elements tab, it visualizes the distribution of node descendants of the currently inspected DOM element, making it easier to locate hidden node heavy parts. It also provides a treemap for BEM component visualization.
After a Google Lighthouse audit complaining an excessive DOM size, have you ever wondered in which corner of your document most DOM nodes are buried? Neither Lighthouse nor the Devtools themselves help finding those areas.
That's what DOM Treemap is for. It extends your Devtools Elements tab with an additional pane which visualizes the distribution of node descendants of the currently inspected DOM element. This makes it easy for you drill down your DOM and to locate all those hidden the node heavy parts.
On top of that there is an extra tab for all those BEM affiniciados which visualizes via yet another treemap how node intensive your different BEM component are in average.
DOM Treemap may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
DOM Treemap has earned a fairly good reputation and likely can be trusted.