diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 56f58a515..e1fcc029a 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -669,9 +669,6 @@ void GUI_App::post_init()
     if (app_config->get("show_hints") == "1" && ! is_gcode_viewer())
         plater_->get_notification_manager()->push_hint_notification(true);
 
-    // 'Send system info' dialog
-    show_send_system_info_dialog_if_needed();
-
     // The extra CallAfter() is needed because of Mac, where this is the only way
     // to popup a modal dialog on start without screwing combo boxes.
     // This is ugly but I honestly found no better way to do it.
@@ -685,6 +682,10 @@ void GUI_App::post_init()
         });
     }
 
+    // 'Send system info' dialog. Again, a CallAfter is needed on mac.
+    // Without it, GL extensions did not show.
+    CallAfter([] { show_send_system_info_dialog_if_needed(); });
+
 #ifdef _WIN32
     // Sets window property to mainframe so other instances can indentify it.
     OtherInstanceMessageHandler::init_windows_properties(mainframe, m_instance_hash_int);
diff --git a/src/slic3r/GUI/SendSystemInfoDialog.cpp b/src/slic3r/GUI/SendSystemInfoDialog.cpp
index 0d5e0c369..eead1f781 100644
--- a/src/slic3r/GUI/SendSystemInfoDialog.cpp
+++ b/src/slic3r/GUI/SendSystemInfoDialog.cpp
@@ -294,6 +294,7 @@ static std::string generate_system_info_json()
     std::string extensions_str = gl_get_string_safe(GL_EXTENSIONS, "");
     std::vector<std::string> extensions_list;
     boost::split(extensions_list, extensions_str, boost::is_any_of(" "), boost::token_compress_off);
+    std::sort(extensions_list.begin(), extensions_list.end());
     pt::ptree extensions_node;
     for (const std::string& s : extensions_list) {
         if (s.empty())