compatibility fix for Chrome v57.0.2987.98 based on https://github.com/schomery/stylish-chrome/issues/43#issuecomment-286348011

background.js

@@ -196,3 +196,10 @@ chrome.storage.local.get('version', prefs => {
 		})
 	}
 });
+
+// bouncing back 'updatePopup' to popup
+chrome.runtime.onMessage.addListener((request, sender) => {
+	if (request.method === 'updatePopup') {
+		chrome.runtime.sendMessage(request);
+	}
+});