Affected properties: - font (missing the values from font-family below) - font-family (missing <generic-family> keywords) - font-feature-settings (missing 'on' and 'off') - font-synthesis (missing all keywords) - font-variant (missing the values from the font-variant-* properties below) - font-variant-alternates (missing all keywords and functions) - font-variant-east-asian (missing all keywords) - font-variant-ligatures (missing all keywords) - font-variant-numeric (missing all keywords) - font-variant-position (missing all keywords) - font-weight (missing all keywords) Test case (to execute in Scratchpad): let DOMUtils = Cc["@mozilla.org/inspector/dom-utils;1"].getService(Ci.inIDOMUtils); let names = ["font", "font-family", "font-feature-settings", "font-synthesis", "font-variant", "font-variant-alternates", "font-variant-east-asian", "font-variant-ligatures", "font-variant-numeric", "font-variant-position", "font-weight"]; for (let name of names) { console.log(DOMUtils.getCSSValuesForProperty(name)); } Sebastian