firefox-kde.patch

+      </hbox>
+    </toolbar>
+
+    <toolbarset id="customToolbars" context="toolbar-context-menu"/>
+
+    <toolbar id="PersonalToolbar"
+             mode="icons" iconsize="small"
+             class="chromeclass-directories"
+             context="toolbar-context-menu"
+             defaultset="personal-bookmarks"
+             toolbarname="&personalbarCmd.label;" accesskey="&personalbarCmd.accesskey;"
+             collapsed="true"
+             customizable="true">
+      <toolbaritem id="personal-bookmarks"
+                   title="&bookmarksToolbarItem.label;"
+                   cui-areatype="toolbar"
+                   removable="true">
+        <toolbarbutton id="bookmarks-toolbar-placeholder"
+                       class="toolbarbutton-1"
+                       mousethrough="never"
+                       label="&bookmarksToolbarItem.label;"
+                       oncommand="PlacesToolbarHelper.onPlaceholderCommand();"/>
+        <hbox flex="1"
+              id="PlacesToolbar"
+              context="placesContext"
+              onclick="BookmarksEventHandler.onClick(event, this._placesView);"
+              oncommand="BookmarksEventHandler.onCommand(event, this._placesView);"
+              tooltip="bhTooltip"
+              popupsinherittooltip="true">
+          <hbox flex="1">
+            <hbox id="PlacesToolbarDropIndicatorHolder" align="center" collapsed="true">
+              <image id="PlacesToolbarDropIndicator"
+                     mousethrough="always"
+                     collapsed="true"/>
+            </hbox>
+            <scrollbox orient="horizontal"
+                       id="PlacesToolbarItems"
+                       flex="1"/>
+            <toolbarbutton type="menu"
+                           id="PlacesChevron"
+                           class="chevron"
+                           mousethrough="never"
+                           collapsed="true"
+                           tooltiptext="&bookmarksToolbarChevron.tooltip;"
+                           onpopupshowing="document.getElementById('PlacesToolbar')
+                                                   ._placesView._onChevronPopupShowing(event);">
+              <menupopup id="PlacesChevronPopup"
+                         placespopup="true"
+                         tooltip="bhTooltip" popupsinherittooltip="true"
+                         context="placesContext"/>
+            </toolbarbutton>
+          </hbox>
+        </hbox>
+      </toolbaritem>
+    </toolbar>
+
+    <!-- This is a shim which will go away ASAP. See bug 749804 for details -->
+    <toolbar id="addon-bar" toolbar-delegate="nav-bar" mode="icons" iconsize="small"
+             customizable="true">
+      <hbox id="addonbar-closebutton"/>
+      <statusbar id="status-bar"/>
+    </toolbar>
+
+    <toolbarpalette id="BrowserToolbarPalette">
+
+# Update primaryToolbarButtons in browser/themes/shared/browser.inc when adding
+# or removing default items with the toolbarbutton-1 class.
+
+      <toolbarbutton id="print-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+#ifdef XP_MACOSX
+                     command="cmd_print"
+                     tooltip="dynamic-shortcut-tooltip"
+#else
+                     command="cmd_printPreview"
+                     tooltiptext="&printButton.tooltip;"
+#endif
+                     label="&printButton.label;"/>
+
+
+      <toolbarbutton id="new-window-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     label="&newNavigatorCmd.label;"
+                     command="key_newNavigator"
+                     tooltip="dynamic-shortcut-tooltip"
+                     ondrop="newWindowButtonObserver.onDrop(event)"
+                     ondragover="newWindowButtonObserver.onDragOver(event)"
+                     ondragenter="newWindowButtonObserver.onDragOver(event)"
+                     ondragexit="newWindowButtonObserver.onDragExit(event)"/>
+
+      <toolbarbutton id="fullscreen-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     observes="View:FullScreen"
+                     type="checkbox"
+                     label="&fullScreenCmd.label;"
+                     tooltip="dynamic-shortcut-tooltip"/>
+
+#ifdef MOZ_SERVICES_SYNC
+      <toolbarbutton id="sync-button"
+                     class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     label="&syncToolbarButton.label;"
+                     oncommand="gSyncUI.handleToolbarButton()"/>
+#endif
+
+      <toolbarbutton id="tabview-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     label="&tabGroupsButton.label;"
+                     command="Browser:ToggleTabView"
+                     tooltip="dynamic-shortcut-tooltip"
+                     observes="tabviewGroupsNumber"/>
+    </toolbarpalette>
+  </toolbox>
+
+  <hbox id="fullscr-toggler" hidden="true"/>
+
+  <deck id="content-deck" flex="1">
+    <hbox flex="1" id="browser">
+      <vbox id="browser-border-start" hidden="true" layer="true"/>
+      <vbox id="sidebar-box" hidden="true" class="chromeclass-extrachrome">
+        <sidebarheader id="sidebar-header" align="center">
+          <label id="sidebar-title" persist="value" flex="1" crop="end" control="sidebar"/>
+          <image id="sidebar-throbber"/>
+          <toolbarbutton class="close-icon tabbable" tooltiptext="&sidebarCloseButton.tooltip;" oncommand="SidebarUI.hide();"/>
+        </sidebarheader>
+        <browser id="sidebar" flex="1" autoscroll="false" disablehistory="true"
+                  style="min-width: 14em; width: 18em; max-width: 36em;" tooltip="aHTMLTooltip"/>
+      </vbox>
+
+      <splitter id="sidebar-splitter" class="chromeclass-extrachrome sidebar-splitter" hidden="true"/>
+      <vbox id="appcontent" flex="1">
+        <notificationbox id="high-priority-global-notificationbox" notificationside="top"/>
+        <tabbrowser id="content"
+                    flex="1" contenttooltip="aHTMLTooltip"
+                    tabcontainer="tabbrowser-tabs"
+                    contentcontextmenu="contentAreaContextMenu"
+                    autocompletepopup="PopupAutoComplete"
+                    selectmenulist="ContentSelectDropdown"/>
+        <chatbar id="pinnedchats" layer="true" mousethrough="always" hidden="true"/>
+      </vbox>
+      <splitter id="social-sidebar-splitter"
+                class="chromeclass-extrachrome sidebar-splitter"
+                observes="socialSidebarBroadcaster"/>
+      <vbox id="social-sidebar-box"
+            class="chromeclass-extrachrome"
+            observes="socialSidebarBroadcaster"
+            persist="width">
+
+        <sidebarheader id="social-sidebar-header" class="sidebar-header" align="center">
+          <image id="social-sidebar-favico"/>
+          <label id="social-sidebar-title" class="sidebar-title" persist="value" flex="1" crop="end" control="sidebar"/>
+          <toolbarbutton id="social-sidebar-button"
+                         class="toolbarbutton-1"
+                         type="menu">
+            <menupopup id="social-statusarea-popup" position="after_end">
+              <menuitem class="social-toggle-sidebar-menuitem"
+                        type="checkbox"
+                        autocheck="false"
+                        command="Social:ToggleSidebar"
+                        label="&social.toggleSidebar.label;"
+                        accesskey="&social.toggleSidebar.accesskey;"/>
+              <menuitem class="social-toggle-notifications-menuitem"
+                        type="checkbox"
+                        autocheck="false"
+                        command="Social:ToggleNotifications"
+                        label="&social.toggleNotifications.label;"
+                        accesskey="&social.toggleNotifications.accesskey;"/>
+              <menuseparator/>
+              <menuseparator class="social-provider-menu" hidden="true"/>
+              <menuitem class="social-addons-menuitem" command="Social:Addons"
+                        label="&social.addons.label;"/>
+              <menuitem label="&social.learnMore.label;"
+                        accesskey="&social.learnMore.accesskey;"
+                        oncommand="SocialUI.showLearnMore();"/>
+            </menupopup>
+          </toolbarbutton>
+        </sidebarheader>
+
+        <browser id="social-sidebar-browser"
+                 type="content"
+                 context="contentAreaContextMenu"
+                 message="true"
+                 messagemanagergroup="social"
+                 disableglobalhistory="true"
+                 tooltip="aHTMLTooltip"
+                 popupnotificationanchor="social-sidebar-favico"
+                 flex="1"
+                 style="min-width: 14em; width: 18em; max-width: 36em;"/>
+      </vbox>
+      <vbox id="browser-border-end" hidden="true" layer="true"/>
+    </hbox>
+#include ../../components/customizableui/content/customizeMode.inc.xul
+  </deck>
+
+  <html:div id="fullscreen-warning" hidden="true">
+    <html:div id="fullscreen-domain-text">
+      &fullscreenWarning.beforeDomain.label;
+      <html:span id="fullscreen-domain"/>
+      &fullscreenWarning.afterDomain.label;
+    </html:div>
+    <html:div id="fullscreen-generic-text">
+      &fullscreenWarning.generic.label;
+    </html:div>
+    <html:button id="fullscreen-exit-button"
+                 onclick="FullScreen.exitDomFullScreen();">
+#ifdef XP_MACOSX
+            &exitDOMFullscreenMac.button;
+#else
+            &exitDOMFullscreen.button;
+#endif
+    </html:button>
+  </html:div>
+
+  <vbox id="browser-bottombox" layer="true">
+    <notificationbox id="global-notificationbox" notificationside="bottom"/>
+    <toolbar id="developer-toolbar"
+             hidden="true">
+#ifdef XP_MACOSX
+          <toolbarbutton id="developer-toolbar-closebutton"
+                         class="devtools-closebutton"
+                         oncommand="DeveloperToolbar.hide();"
+                         tooltiptext="&devToolbarCloseButton.tooltiptext;"/>
+#endif
+          <stack class="gclitoolbar-stack-node" flex="1">
+            <textbox class="gclitoolbar-input-node" rows="1"/>
+            <hbox class="gclitoolbar-complete-node"/>
+          </stack>
+          <toolbarbutton id="developer-toolbar-toolbox-button"
+                         class="developer-toolbar-button"
+                         observes="devtoolsMenuBroadcaster_DevToolbox"
+                         tooltiptext="&devToolbarToolsButton.tooltip;"/>
+#ifndef XP_MACOSX
+          <toolbarbutton id="developer-toolbar-closebutton"
+                         class="devtools-closebutton"
+                         oncommand="DeveloperToolbar.hide();"
+                         tooltiptext="&devToolbarCloseButton.tooltiptext;"/>
+#endif
+   </toolbar>
+  </vbox>
+
+  <svg:svg height="0">
+#include tab-shape.inc.svg
+    <svg:clipPath id="urlbar-back-button-clip-path">
+#ifndef XP_MACOSX
+      <svg:path d="M -9,-4 l 0,1 a 15 15 0 0,1 0,30 l 0,1 l 10000,0 l 0,-32 l -10000,0 z" />
+#else
+      <svg:path d="M -11,-5 a 16 16 0 0 1 0,34 l 10000,0 l 0,-34 l -10000,0 z"/>
+#endif
+    </svg:clipPath>
+#ifdef XP_WIN
+    <svg:clipPath id="urlbar-back-button-clip-path-win10">
+      <svg:path d="M -6,-2 l 0,1 a 15 15 0 0,1 0,30 l 0,1 l 10000,0 l 0,-32 l -10000,0 z" />
+    </svg:clipPath>
+#endif
+  </svg:svg>
+
+</vbox>
+# <iframe id="tab-view"> is dynamically appended as the 2nd child of #tab-view-deck.
+#     Introducing the iframe dynamically, as needed, was found to be better than
+#     starting with an empty iframe here in browser.xul from a Ts standpoint.
+</deck>
+
+</window>
diff --git a/browser/base/jar.mn b/browser/base/jar.mn
--- a/browser/base/jar.mn
+++ b/browser/base/jar.mn
@@ -70,16 +70,18 @@ browser.jar:
         content/browser/aboutSocialError.xhtml        (content/aboutSocialError.xhtml)
         content/browser/aboutProviderDirectory.xhtml  (content/aboutProviderDirectory.xhtml)
         content/browser/aboutTabCrashed.css           (content/aboutTabCrashed.css)
         content/browser/aboutTabCrashed.js            (content/aboutTabCrashed.js)
         content/browser/aboutTabCrashed.xhtml         (content/aboutTabCrashed.xhtml)
 *       content/browser/browser.css                   (content/browser.css)
 *       content/browser/browser.js                    (content/browser.js)
 *       content/browser/browser.xul                   (content/browser.xul)
+*       content/browser/browser-kde.xul               (content/browser-kde.xul)
+%       override chrome://browser/content/browser.xul chrome://browser/content/browser-kde.xul desktop=kde
 *       content/browser/browser-tabPreviews.xml       (content/browser-tabPreviews.xml)
 *       content/browser/chatWindow.xul                (content/chatWindow.xul)
         content/browser/tab-content.js                (content/tab-content.js)
         content/browser/content.js                    (content/content.js)
         content/browser/social-content.js             (content/social-content.js)
         content/browser/defaultthemes/1.footer.jpg    (content/defaultthemes/1.footer.jpg)
         content/browser/defaultthemes/1.header.jpg    (content/defaultthemes/1.header.jpg)
         content/browser/defaultthemes/1.icon.jpg      (content/defaultthemes/1.icon.jpg)
diff --git a/browser/components/build/nsModule.cpp b/browser/components/build/nsModule.cpp
--- a/browser/components/build/nsModule.cpp
+++ b/browser/components/build/nsModule.cpp
@@ -8,17 +8,17 @@
 #include "nsBrowserCompsCID.h"
 #include "DirectoryProvider.h"
 
 #if defined(XP_WIN)
 #include "nsWindowsShellService.h"
 #elif defined(XP_MACOSX)
 #include "nsMacShellService.h"
 #elif defined(MOZ_WIDGET_GTK)
-#include "nsGNOMEShellService.h"
+#include "nsUnixShellService.h"
 #endif
 
 #if defined(XP_WIN)
 #include "nsIEHistoryEnumerator.h"
 #include "nsEdgeReadingListExtractor.h"
 #endif
 
 #include "rdf.h"
@@ -32,18 +32,16 @@ using namespace mozilla::browser;
 
 /////////////////////////////////////////////////////////////////////////////
 
 NS_GENERIC_FACTORY_CONSTRUCTOR(DirectoryProvider)
 #if defined(XP_WIN)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsWindowsShellService)
 #elif defined(XP_MACOSX)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsMacShellService)
-#elif defined(MOZ_WIDGET_GTK)
-NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsGNOMEShellService, Init)
 #endif
 
 #if defined(XP_WIN)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsIEHistoryEnumerator)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsEdgeReadingListExtractor)
 #endif
 
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsFeedSniffer)
@@ -63,17 +61,17 @@ NS_DEFINE_NAMED_CID(NS_EDGEREADINGLISTEX
 NS_DEFINE_NAMED_CID(NS_SHELLSERVICE_CID);
 #endif
 
 static const mozilla::Module::CIDEntry kBrowserCIDs[] = {
     { &kNS_BROWSERDIRECTORYPROVIDER_CID, false, nullptr, DirectoryProviderConstructor },
 #if defined(XP_WIN)
     { &kNS_SHELLSERVICE_CID, false, nullptr, nsWindowsShellServiceConstructor },
 #elif defined(MOZ_WIDGET_GTK)
-    { &kNS_SHELLSERVICE_CID, false, nullptr, nsGNOMEShellServiceConstructor },
+    { &kNS_SHELLSERVICE_CID, false, nullptr, nsUnixShellServiceConstructor },
 #endif
     { &kNS_FEEDSNIFFER_CID, false, nullptr, nsFeedSnifferConstructor },
     { &kNS_BROWSER_ABOUT_REDIRECTOR_CID, false, nullptr, AboutRedirector::Create },
 #if defined(XP_WIN)
     { &kNS_WINIEHISTORYENUMERATOR_CID, false, nullptr, nsIEHistoryEnumeratorConstructor },
     { &kNS_EDGEREADINGLISTEXTRACTOR_CID, false, nullptr, nsEdgeReadingListExtractorConstructor },
 #elif defined(XP_MACOSX)
     { &kNS_SHELLSERVICE_CID, false, nullptr, nsMacShellServiceConstructor },
diff --git a/browser/components/preferences/in-content/main.js b/browser/components/preferences/in-content/main.js
--- a/browser/components/preferences/in-content/main.js
+++ b/browser/components/preferences/in-content/main.js
@@ -14,16 +14,22 @@ var gMainPane = {
   init: function ()
   {
     function setEventListener(aId, aEventType, aCallback)
     {
       document.getElementById(aId)
               .addEventListener(aEventType, aCallback.bind(gMainPane));
     }
 
+    var env = Components.classes["@mozilla.org/process/environment;1"]
+                          .getService(Components.interfaces.nsIEnvironment);
+    var kde_session = 0;
+    if (env.get('KDE_FULL_SESSION') == "true")
+        kde_session = 1;
+
 #ifdef HAVE_SHELL_SERVICE
     this.updateSetDefaultBrowser();
 #ifdef XP_WIN
     // In Windows 8 we launch the control panel since it's the only
     // way to get all file type association prefs. So we don't know
     // when the user will select the default.  We refresh here periodically
     // in case the default changes.  On other Windows OS's defaults can also
     // be set while the prefs are open.
@@ -711,16 +717,27 @@ var gMainPane = {
    */
   setDefaultBrowser: function()
   {
     let shellSvc = getShellService();
     if (!shellSvc)
       return;
     try {
       shellSvc.setDefaultBrowser(true, false);
+      if (kde_session == 1) {
+        var shellObj = Components.classes["@mozilla.org/file/local;1"]
+                                   .createInstance(Components.interfaces.nsILocalFile);
+        shellObj.initWithPath("/usr/bin/kwriteconfig");
+        var process = Components.classes["@mozilla.org/process/util;1"]
+                                  .createInstance(Components.interfaces.nsIProcess);
+        process.init(shellObj);
+        var args = ["--file", "kdeglobals", "--group", "General", "--key",
+            "BrowserApplication", "firefox"];
+        process.run(false, args, args.length);
+      }
     } catch (ex) {
       Cu.reportError(ex);
       return;
     }
     let selectedIndex =
       shellSvc.isDefaultBrowser(false, true) ? 1 : 0;
     document.getElementById("setDefaultPane").selectedIndex = selectedIndex;
   }
diff --git a/browser/components/shell/moz.build b/browser/components/shell/moz.build
--- a/browser/components/shell/moz.build
+++ b/browser/components/shell/moz.build
@@ -30,16 +30,18 @@ if CONFIG['OS_ARCH'] == 'WINNT':
     ]
 elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
     SOURCES += [
         'nsMacShellService.cpp',
     ]
 elif CONFIG['MOZ_WIDGET_GTK']:
     SOURCES += [
         'nsGNOMEShellService.cpp',
+	'nsKDEShellService.cpp',
+	'nsUnixShellService.cpp',
     ]
 
 if SOURCES:
     FINAL_LIBRARY = 'browsercomps'
 
 EXTRA_COMPONENTS += [
     'nsSetDefaultBrowser.js',
     'nsSetDefaultBrowser.manifest',
diff --git a/browser/components/shell/nsKDEShellService.cpp b/browser/components/shell/nsKDEShellService.cpp
new file mode 100644
--- /dev/null
+++ b/browser/components/shell/nsKDEShellService.cpp
@@ -0,0 +1,292 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ArrayUtils.h"
+
+#include "nsCOMPtr.h"
+#include "nsKDEShellService.h"
+#include "nsShellService.h"
+#include "nsKDEUtils.h"
+#include "nsIPrefService.h"
+#include "nsIProcess.h"
+#include "nsIFile.h"
+#include "nsServiceManagerUtils.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIMutableArray.h"
+#include "nsISupportsPrimitives.h"
+#include "nsArrayUtils.h"
+
+using namespace mozilla;
+
+nsresult
+nsKDEShellService::Init()
+{
+    if( !nsKDEUtils::kdeSupport())
+        return NS_ERROR_NOT_AVAILABLE;
+    return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(nsKDEShellService, nsIShellService)
+
+NS_IMETHODIMP
+nsKDEShellService::IsDefaultBrowser(bool aStartupCheck,
+                                    bool aForAllTypes,
+                                    bool* aIsDefaultBrowser)
+{
+    *aIsDefaultBrowser = false;
+    if (aStartupCheck)
+        mCheckedThisSession = true;
+
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if (!command)
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> str = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if (!str)
+        return NS_ERROR_FAILURE;
+
+    str->SetData( NS_LITERAL_CSTRING( "ISDEFAULTBROWSER" ));
+    command->AppendElement( str, false );
+
+    if( nsKDEUtils::command( command ))
+        *aIsDefaultBrowser = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::SetDefaultBrowser(bool aClaimAllTypes,
+                                     bool aForAllUsers)
+{
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if (!command)
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> cmdstr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    nsCOMPtr<nsISupportsCString> paramstr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if (!cmdstr || !paramstr)
+        return NS_ERROR_FAILURE;
+
+    cmdstr->SetData( NS_LITERAL_CSTRING( "SETDEFAULTBROWSER" ));
+    command->AppendElement( cmdstr, false );
+
+    paramstr->SetData( aClaimAllTypes ? NS_LITERAL_CSTRING( "ALLTYPES" ) : NS_LITERAL_CSTRING( "NORMAL" ));
+    command->AppendElement( paramstr, false );
+
+    return nsKDEUtils::command( command ) ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::GetShouldSkipCheckDefaultBrowser(bool* aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+
+  nsresult rv;
+  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID, &rv));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  rv = prefs->GetBoolPref(PREF_SKIPDEFAULTBROWSERCHECK, aResult);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  if (*aResult) {
+    // Only skip the default browser check once. The next attempt in
+    // a new session should proceed.
+    return prefs->SetBoolPref(PREF_SKIPDEFAULTBROWSERCHECK, false);
+  }
+
+  int32_t defaultBrowserCheckCount;
+  rv = prefs->GetIntPref(PREF_DEFAULTBROWSERCHECKCOUNT,
+                         &defaultBrowserCheckCount);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  if (defaultBrowserCheckCount < 4) {
+    *aResult = false;
+    return prefs->SetIntPref(PREF_DEFAULTBROWSERCHECKCOUNT,
+                             defaultBrowserCheckCount + 1);
+  }
+
+  // Disable the default browser check after three attempts.
+  // Don't modify PREF_CHECKDEFAULTBROWSER since that is a
+  // user-initiated action and it shouldn't get re-enabled
+  // if it has been user disabled.
+  *aResult = true;
+  return rv;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::GetShouldCheckDefaultBrowser(bool* aResult)
+{
+  // If we've already checked, the browser has been started and this is a
+  // new window open, and we don't want to check again.
+  if (mCheckedThisSession) {
+    *aResult = false;
+    return NS_OK;
+  }
+
+  nsresult rv;
+#ifndef RELEASE_BUILD
+  bool skipDefaultBrowserCheck;
+  rv = GetShouldSkipCheckDefaultBrowser(&skipDefaultBrowserCheck);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  if (skipDefaultBrowserCheck) {
+    *aResult = false;
+    return rv;
+  }
+#endif
+
+  nsCOMPtr<nsIPrefBranch> prefs;
+  nsCOMPtr<nsIPrefService> pserve(do_GetService(NS_PREFSERVICE_CONTRACTID));
+  if (pserve)
+    pserve->GetBranch("", getter_AddRefs(prefs));
+
+  if (prefs)
+    prefs->GetBoolPref(PREF_CHECKDEFAULTBROWSER, aResult);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::SetShouldCheckDefaultBrowser(bool aShouldCheck)
+{
+  nsCOMPtr<nsIPrefBranch> prefs;
+  nsCOMPtr<nsIPrefService> pserve(do_GetService(NS_PREFSERVICE_CONTRACTID));
+  if (pserve)
+    pserve->GetBranch("", getter_AddRefs(prefs));
+
+  if (prefs)
+    prefs->SetBoolPref(PREF_CHECKDEFAULTBROWSER, aShouldCheck);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::GetCanSetDesktopBackground(bool* aResult)
+{
+  *aResult = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::SetDesktopBackground(nsIDOMElement* aElement,
+                                          PRInt32 aPosition)
+{
+    return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::GetDesktopBackgroundColor(PRUint32 *aColor)
+{
+    return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::SetDesktopBackgroundColor(PRUint32 aColor)
+{
+    return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::OpenApplication(PRInt32 aApplication)
+{
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if (!command)
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> str = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if (!str)
+        return NS_ERROR_FAILURE;
+
+    if( aApplication == APPLICATION_MAIL )
+        str->SetData( NS_LITERAL_CSTRING( "OPENMAIL" ));
+    else if( aApplication == APPLICATION_NEWS )
+        str->SetData( NS_LITERAL_CSTRING( "OPENNEWS" ));
+    else
+        return NS_ERROR_NOT_IMPLEMENTED;
+
+    command->AppendElement( str, false );
+    return nsKDEUtils::command( command ) ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::OpenApplicationWithURI(nsIFile* aApplication, const nsACString& aURI)
+{
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if (!command)
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> cmdstr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    nsCOMPtr<nsISupportsCString> appstr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    nsCOMPtr<nsISupportsCString> uristr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if (!cmdstr || !appstr || !uristr)
+        return NS_ERROR_FAILURE;
+
+    cmdstr->SetData( NS_LITERAL_CSTRING( "RUN" ));
+    command->AppendElement( cmdstr, false );
+    nsAutoCString app;
+    nsresult rv = aApplication->GetNativePath( app );
+    NS_ENSURE_SUCCESS( rv, rv );
+    appstr->SetData( app );
+    command->AppendElement( appstr, false );
+    uristr->SetData( aURI );
+    command->AppendElement( uristr, false );
+    return nsKDEUtils::command( command ) ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::GetDefaultFeedReader(nsIFile** _retval)
+{
+    *_retval = nullptr;
+
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if( !command )
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> str = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if( !str )
+        return NS_ERROR_FAILURE;
+
+    str->SetData( NS_LITERAL_CSTRING( "GETDEFAULTFEEDREADER" ));
+    command->AppendElement( str, false );
+
+    nsCOMPtr<nsIArray> output;
+    if( !nsKDEUtils::command( command, getter_AddRefs( output ) ) )
+        return NS_ERROR_FAILURE;
+
+    PRUint32 length;
+    output->GetLength( &length );
+    if( length != 1 )
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> resstr = do_QueryElementAt( output, 0 );
+    if( !resstr )
+        return NS_ERROR_FAILURE;
+
+    nsAutoCString path;
+    resstr->GetData( path );
+    if (path.IsEmpty())
+        return NS_ERROR_FAILURE;
+
+    nsresult rv;
+    nsCOMPtr<nsIFile> defaultReader =
+        do_CreateInstance("@mozilla.org/file/local;1", &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = defaultReader->InitWithNativePath(path);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    bool exists;
+    rv = defaultReader->Exists(&exists);
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (!exists)
+        return NS_ERROR_FAILURE;
+
+    NS_ADDREF(*_retval = defaultReader);
+    return NS_OK;
+}
diff --git a/browser/components/shell/nsKDEShellService.h b/browser/components/shell/nsKDEShellService.h
new file mode 100644
--- /dev/null
+++ b/browser/components/shell/nsKDEShellService.h
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nskdeshellservice_h____
+#define nskdeshellservice_h____
+
+#include "nsIShellService.h"
+#include "nsStringAPI.h"
+#include "mozilla/Attributes.h"
+
+class nsKDEShellService final : public nsIShellService
+{
+public:
+  nsKDEShellService() : mCheckedThisSession(false) { }
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISHELLSERVICE
+
+  nsresult Init();
+
+private:
+  ~nsKDEShellService() {}
+
+  bool mCheckedThisSession;
+};
+
+#endif // nskdeshellservice_h____
diff --git a/browser/components/shell/nsUnixShellService.cpp b/browser/components/shell/nsUnixShellService.cpp
new file mode 100644
--- /dev/null
+++ b/browser/components/shell/nsUnixShellService.cpp
@@ -0,0 +1,22 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+#include "nsUnixShellService.h"
+#include "nsGNOMEShellService.h"
+#include "nsKDEShellService.h"
+#include "nsKDEUtils.h"
+#include "mozilla/ModuleUtils.h"
+
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsGNOMEShellService, Init)
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsKDEShellService, Init)
+
+NS_METHOD
+nsUnixShellServiceConstructor(nsISupports *aOuter, REFNSIID aIID, void **aResult)
+{
+    if( nsKDEUtils::kdeSupport())
+        return nsKDEShellServiceConstructor( aOuter, aIID, aResult );
+    return nsGNOMEShellServiceConstructor( aOuter, aIID, aResult );
+}
diff --git a/browser/components/shell/nsUnixShellService.h b/browser/components/shell/nsUnixShellService.h
new file mode 100644
--- /dev/null
+++ b/browser/components/shell/nsUnixShellService.h
@@ -0,0 +1,15 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+#ifndef nsunixshellservice_h____
+#define nsunixshellservice_h____
+
+#include "nsIShellService.h"
+
+NS_METHOD
+nsUnixShellServiceConstructor(nsISupports *aOuter, REFNSIID aIID, void **aResult);
+
+#endif // nsunixshellservice_h____
diff --git a/browser/installer/package-manifest.in b/browser/installer/package-manifest.in
--- a/browser/installer/package-manifest.in
+++ b/browser/installer/package-manifest.in
@@ -709,16 +709,17 @@
 @RESPATH@/defaults/autoconfig/prefcalls.js
 @RESPATH@/browser/defaults/profile/prefs.js
 @RESPATH@/browser/defaults/permissions
 
 ; Warning: changing the path to channel-prefs.js can cause bugs (Bug 756325)
 ; Technically this is an app pref file, but we are keeping it in the original
 ; gre location for now.
 @RESPATH@/defaults/pref/channel-prefs.js
+@BINPATH@/defaults/pref/kde.js
 
 ; Services (gre) prefs
 #ifdef MOZ_SERVICES_NOTIFICATIONS
 @RESPATH@/defaults/pref/services-notifications.js
 #endif
 #ifdef MOZ_SERVICES_SYNC
 @RESPATH@/defaults/pref/services-sync.js
 #endif