"How I contributed to Firefox DevTools" (opens in new tab)

I Fixed a Firefox DevTools Bug (Bug 1717176) When an element had box-sizing: border-box, the width and height fields in Firefox DevTools Box Model panel were not editable at all. The Fix Two things needed to change: Unlock editing — BoxModelMain.js was explicitly blocking border-box elements from being editable. Correct the value — border-box width includes padding and borders, so I had to subtract them when opening the editor, and add them back when writing the new value. if (isBorderBox && ...