#129 black-on-black system colors

user.js

@@ -1186,6 +1186,7 @@ user_pref("browser.pagethumbnails.capturing_disabled", true); // (hidden pref)
 /* 2608: disable JAR from opening Unsafe File Types ***/
 user_pref("network.jar.open-unsafe-types", false);
 /* 2609: disable exposure of system colors to CSS or canvas (FF44+)
+ * [NOTE] see [2] bug may cause black on black for elements with undefined colors
  * [1] https://bugzilla.mozilla.org/show_bug.cgi?id=232227
  * [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1330876 ***/
 user_pref("ui.use_standins_for_native_colors", true); // (hidden pref)