Write snippets of code and iterate on them faster in the WebConsole with the
new multi-line editor mode. The Enter key adds new lines like in a regular editor. Evaluate with Ctrl + Enter (Cmd + Enter on OSX).
Firefox now supports the CSS properties "text-decoration-thickness" and "text-underline-offset", which let web developers control the position and size of text decoration lines.
Firefox now supports the CSS property "text-decoration-skip-ink", which (by default) makes underlines and overlines skip over any text that they intersect, to improve readability.
DOM Breakpoints in Developer Tools allows diagnose with code in a page changes a specific DOM node, including the node's children