Bug 243412: Add box-sizing preference to control the vendor prefix; r=dbaron

layout/style/nsCSSPropAliasList.h

@@ -118,7 +118,7 @@ CSS_PROP_ALIAS(-moz-animation-timing-function,
 CSS_PROP_ALIAS(-moz-box-sizing,
                box_sizing,
                MozBoxSizing,
-               "")
+               "layout.css.prefixes.box-sizing")
 CSS_PROP_ALIAS(font-feature-settings,
                font_feature_settings,
                FontFeatureSettings,

modules/libpref/src/init/all.js

@@ -1785,6 +1785,7 @@ pref("layout.css.prefixes.border-image", true);
 pref("layout.css.prefixes.transforms", true);
 pref("layout.css.prefixes.transitions", true);
 pref("layout.css.prefixes.animations", true);
+pref("layout.css.prefixes.box-sizing", true);
 
 // Is support for the :scope selector enabled?
 #ifdef RELEASE_BUILD