Don't use webextension polyfill for messages

src/drivers/webextension/js/driver.js

@@ -64,7 +64,7 @@
 				localStorage['version'] = version;
 			} catch(e) { }
 
-			browser.runtime.onMessage.addListener(function(message, sender, sendResponse) {
+			function newMsg(message, sender, sendResponse) {
 				var
 					hostname,
 					a = document.createElement('a');
@@ -105,7 +105,12 @@
 							break;
 					}
 				}
-			});
+			}
+      if (typeof chrome === "undefined") {
+        browser.runtime.onMessage.addListener(newMsg);
+      } else {
+        chrome.runtime.onMessage.addListener(newMsg);
+      }
 
 			browser.tabs.query({}).then(function(tabs) {
 				tabs.forEach(function(tab) {

src/drivers/webextension/js/popup.js

@@ -30,7 +30,7 @@ document.addEventListener('DOMContentLoaded', function() {
 			var appName, confidence, version;
 
 			browser.tabs.query({ active: true }).then(function(tabs) {
-				browser.runtime.sendMessage({ id: 'get_apps', tab: tabs[0] }, function(response) {
+        function sendGetApps(response) {
 					if ( response.tabCache && response.tabCache.count > 0 ) {
 						detectedApps.innerHTML = '';
 
@@ -59,7 +59,12 @@ document.addEventListener('DOMContentLoaded', function() {
 							detectedApps.innerHTML = detectedApps.innerHTML + html;
 						}
 					}
-				});
+				}
+        if (typeof chrome === "undefined") {
+          browser.runtime.sendMessage({ id: 'get_apps', tab: tabs[0] }, sendGetApps);
+        } else {
+          chrome.runtime.sendMessage({ id: 'get_apps', tab: tabs[0] }, sendGetApps);
+        }
 			});
 		}
 	};