Remove synchronous loading of javascript:'' in SubframeLoader::requestFrame Comment there states: // FIXME: Some sites rely on the javascript:'' loading synchronously, which is why we have this special case. // Blink has the same workaround (https://bugs.chromium.org/p/chromium/issues/detail?id=923585). Blink has since removed it. We should confirm we can, as well. And then do so.