diff --git a/Build.PL b/Build.PL
index 31ec9cf82..e006d11eb 100644
--- a/Build.PL
+++ b/Build.PL
@@ -40,10 +40,7 @@ if ($gui) {
     Socket                          2.016
     );
     %recommends = qw(
-    Growl::GNTP                     0.15
     Wx::GLCanvas                    0
-    LWP::UserAgent                  0
-    Net::Bonjour                    0
     );
     if ($^O eq 'MSWin32') {
         $recommends{"Win32::TieRegistry"} = 0;
diff --git a/lib/Slic3r/GUI.pm b/lib/Slic3r/GUI.pm
index 1aa6ba955..2bb5c9e4a 100644
--- a/lib/Slic3r/GUI.pm
+++ b/lib/Slic3r/GUI.pm
@@ -34,7 +34,6 @@ use Slic3r::GUI::SystemInfo;
 use Wx::Locale gettext => 'L';
 
 our $have_OpenGL = eval "use Slic3r::GUI::3DScene; 1";
-our $have_LWP    = eval "use LWP::UserAgent; 1";
 
 use Wx 0.9901 qw(:bitmap :dialog :icon :id :misc :systemsettings :toplevelwindow :filedialog :font);
 use Wx::Event qw(EVT_IDLE EVT_COMMAND EVT_MENU);
diff --git a/lib/Slic3r/GUI/MainFrame.pm b/lib/Slic3r/GUI/MainFrame.pm
index c53237228..4868ed7e2 100644
--- a/lib/Slic3r/GUI/MainFrame.pm
+++ b/lib/Slic3r/GUI/MainFrame.pm
@@ -25,10 +25,6 @@ our $last_config;
 our $VALUE_CHANGE_EVENT    = Wx::NewEventType;
 # 2) To inform about a preset selection change or a "modified" status change.
 our $PRESETS_CHANGED_EVENT = Wx::NewEventType;
-# 3) To inform about a click on Browse button
-our $BUTTON_BROWSE_EVENT   = Wx::NewEventType;
-# 4) To inform about a click on Test button
-our $BUTTON_TEST_EVENT     = Wx::NewEventType;
 
 sub new {
     my ($class, %params) = @_;
@@ -169,54 +165,6 @@ sub _init_tabpanel {
             }
         }
     });
-    # The following event is emited by the C++ Tab implementation ,
-    # when the Browse button was clicked
-    EVT_COMMAND($self, -1, $BUTTON_BROWSE_EVENT, sub {
-        my ($self, $event) = @_;
-        my $msg = $event->GetString;
-
-        # look for devices
-        my $entries;
-        {
-            my $res = Net::Bonjour->new('http');
-            $res->discover;
-            $entries = [ $res->entries ];
-        }
-        if (@{$entries}) {
-            my $dlg = Slic3r::GUI::BonjourBrowser->new($self, $entries);
-            my $tab = Slic3r::GUI::get_preset_tab("printer");
-            $tab->load_key_value('octoprint_host', $dlg->GetValue . ":" . $dlg->GetPort)
-                if $dlg->ShowModal == wxID_OK;
-        } else {
-            Wx::MessageDialog->new($self, L('No Bonjour device found'), L('Device Browser'), wxOK | wxICON_INFORMATION)->ShowModal;
-        }
-    });
-    # The following event is emited by the C++ Tab implementation ,
-    # when the Test button was clicked
-    EVT_COMMAND($self, -1, $BUTTON_TEST_EVENT, sub {
-        my ($self, $event) = @_;
-        my $msg = $event->GetString;
-
-        my $ua = LWP::UserAgent->new;
-        $ua->timeout(10);
-
-        my $config = Slic3r::GUI::get_preset_tab("printer")->get_config;
-        my $res = $ua->get(
-            "http://" . $config->octoprint_host . "/api/version",
-            'X-Api-Key' => $config->octoprint_apikey,
-        );
-        if ($res->is_success) {
-            Slic3r::GUI::show_info($self, L("Connection to OctoPrint works correctly."), _L("Success!"));
-        } else {
-            Slic3r::GUI::show_error($self,
-                L("I wasn't able to connect to OctoPrint (") . $res->status_line . 
-                L("). Check hostname and OctoPrint version (at least 1.1.0 is required)."));
-        }
-    });
-    # A variable to inform C++ Tab implementation about disabling of Browse button
-    $self->{is_disabled_button_browse} = (!eval "use Net::Bonjour; 1") ? 1 : 0 ;
-    # A variable to inform C++ Tab implementation about user_agent
-    $self->{is_user_agent} = (eval "use LWP::UserAgent; 1") ? 1 : 0 ;    
     Slic3r::GUI::create_preset_tabs($self->{no_controller}, $VALUE_CHANGE_EVENT, $PRESETS_CHANGED_EVENT);
     $self->{options_tabs} = {};
     for my $tab_name (qw(print filament printer)) {
diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index bb3a4c130..8a533f28d 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -8,7 +8,6 @@ use utf8;
 use File::Basename qw(basename dirname);
 use List::Util qw(sum first max);
 use Slic3r::Geometry qw(X Y Z scale unscale deg2rad rad2deg);
-use LWP::UserAgent;
 use threads::shared qw(shared_clone);
 use Wx qw(:button :colour :cursor :dialog :filedialog :keycode :icon :font :id :listctrl :misc 
     :panel :sizer :toolbar :window wxTheApp :notebook :combobox wxNullBitmap);