Disabling randomorange test, rs=randomorange, see bug 927064 for improving this test.

browser/components/customizableui/test/browser.ini

@@ -22,8 +22,9 @@ support-files =
 [browser_913972_currentset_overflow.js]
 
 [browser_914138_widget_API_overflowable_toolbar.js]
-# Because of the specific widths, this test is fragile and won't necessarily pass on other platforms
-run-if = os == "mac"
+# Because of the specific widths, this test is fragile and has been disabled.
+# NB: it was designed for mac only, but started randomly failing there.
+skip-if = true
 
 [browser_914863_disabled_help_quit_buttons.js]
 [browser_918049_skipintoolbarset_dnd.js]