Bug 1394963 - Skip browser_newtab_fullscreen_focus.js on osx/debug for 200+ failures; r=me,test-only

browser/base/content/test/newtab/browser.ini

@@ -31,6 +31,7 @@ subsuite = clipboard
 [browser_newtab_drop_preview.js]
 [browser_newtab_focus.js]
 [browser_newtab_fullscreen_focus.js]
+skip-if = os == "mac" && debug # bug 1394963
 [browser_newtab_perwindow_private_browsing.js]
 [browser_newtab_reflow_load.js]
 support-files =