[chrome-gnome-shell] firefox: show usefull error message in case native connector not installed.

[Yuri Konotopov <ykonotopov src gnome org>]

commit dd9c87a3ddab1e9eba362978a924c97c039385c5
Author: Yuri Konotopov <ykonotopov gnome org>
Date:   Tue Mar 21 00:08:31 2017 +0400

    firefox: show usefull error message in case native connector not installed.
    
    Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=780282

 extension/include/gsc.js |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/extension/include/gsc.js b/extension/include/gsc.js
index fc3945e..be80d14 100644
--- a/extension/include/gsc.js
+++ b/extension/include/gsc.js
@@ -54,7 +54,8 @@ GSC = (function() {
                                                        if (
                                                                chrome.runtime.lastError &&
                                                                chrome.runtime.lastError.message &&
-                                                               
chrome.runtime.lastError.message.indexOf("host not found") === -1
+                                                               
chrome.runtime.lastError.message.indexOf("host not found") === -1 && // Chrome
+                                                               
chrome.runtime.lastError.message.indexOf("disconnected port") === -1 // Firefox
                                                        )
                                                        {
                                                                // Some error occured. Show to user