diff --git a/kcmkwin/kwinrules/ruleswidget.h b/kcmkwin/kwinrules/ruleswidget.h
--- a/kcmkwin/kwinrules/ruleswidget.h
+++ b/kcmkwin/kwinrules/ruleswidget.h
@@ -90,6 +90,7 @@
     void updateEnableautogroupid();
     void updateEnableopacityactive();
     void updateEnableopacityinactive();
+    void updateEnableblur();
     // workarounds tab
     void updateEnablefsplevel();
     void updateEnablefpplevel();
diff --git a/kcmkwin/kwinrules/ruleswidget.cpp b/kcmkwin/kwinrules/ruleswidget.cpp
--- a/kcmkwin/kwinrules/ruleswidget.cpp
+++ b/kcmkwin/kwinrules/ruleswidget.cpp
@@ -120,6 +120,7 @@
     SETUP(autogroupid, force);
     SETUP(opacityactive, force);
     SETUP(opacityinactive, force);
+    SETUP(blur, force);
     SETUP(shortcut, force);
     // workarounds tab
     SETUP(fsplevel, force);
@@ -216,6 +217,7 @@
 UPDATE_ENABLE_SLOT(autogroupid)
 UPDATE_ENABLE_SLOT(opacityactive)
 UPDATE_ENABLE_SLOT(opacityinactive)
+UPDATE_ENABLE_SLOT(blur)
 void RulesWidget::updateEnableshortcut()
 {
     shortcut->setEnabled(enable_shortcut->isChecked() && rule_shortcut->currentIndex() != 0);
@@ -538,6 +540,7 @@
     LINEEDIT_FORCE_RULE(autogroupid,);
     SPINBOX_FORCE_RULE(opacityactive,);
     SPINBOX_FORCE_RULE(opacityinactive,);
+    CHECKBOX_FORCE_RULE(blur,);
     LINEEDIT_SET_RULE(shortcut,);
     COMBOBOX_FORCE_RULE(fsplevel,);
     COMBOBOX_FORCE_RULE(fpplevel,);
@@ -643,6 +646,7 @@
     LINEEDIT_FORCE_RULE(autogroupid,);
     SPINBOX_FORCE_RULE(opacityactive,);
     SPINBOX_FORCE_RULE(opacityinactive,);
+    CHECKBOX_FORCE_RULE(blur,);
     LINEEDIT_SET_RULE(shortcut,);
     COMBOBOX_FORCE_RULE(fsplevel,);
     COMBOBOX_FORCE_RULE(fpplevel,);
@@ -764,6 +768,7 @@
     //LINEEDIT_PREFILL( autogroupid, );
     SPINBOX_PREFILL(opacityactive, , 100 /*get the actual opacity somehow*/);
     SPINBOX_PREFILL(opacityinactive, , 100 /*get the actual opacity somehow*/);
+    CHECKBOX_PREFILL(blur, , false /*get the actual blur somehow*/);
     //LINEEDIT_PREFILL( shortcut, );
     //COMBOBOX_PREFILL( fsplevel, );
     //COMBOBOX_PREFILL( fpplevel, );
@@ -803,6 +808,7 @@
     //LINEEDIT_PREFILL( autogroupid, );
     SPINBOX_PREFILL(opacityactive, , 100 /*get the actual opacity somehow*/);
     SPINBOX_PREFILL(opacityinactive, , 100 /*get the actual opacity somehow*/);
+    CHECKBOX_PREFILL(blur, , false /*get the actual blur somehow*/);
     //LINEEDIT_PREFILL( shortcut, );
     //COMBOBOX_PREFILL( fsplevel, );
     //COMBOBOX_PREFILL( fpplevel, );
diff --git a/kcmkwin/kwinrules/ruleswidgetbase.ui b/kcmkwin/kwinrules/ruleswidgetbase.ui
--- a/kcmkwin/kwinrules/ruleswidgetbase.ui
+++ b/kcmkwin/kwinrules/ruleswidgetbase.ui
@@ -7,14 +7,14 @@
     <x>0</x>
     <y>0</y>
     <width>592</width>
-    <height>588</height>
+    <height>645</height>
    </rect>
   </property>
   <layout class="QGridLayout" name="gridLayout_3">
    <item row="0" column="1">
     <widget class="QTabWidget" name="tabs">
      <property name="currentIndex">
-      <number>0</number>
+      <number>3</number>
      </property>
      <widget class="QWidget" name="TabPage1">
       <attribute name="title">
@@ -2086,14 +2086,14 @@
          </property>
         </widget>
        </item>
-       <item row="6" column="0" rowspan="2" colspan="3">
+       <item row="7" column="0" rowspan="2" colspan="3">
         <widget class="Line" name="line_15">
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
          </property>
         </widget>
        </item>
-       <item row="6" column="3">
+       <item row="7" column="3">
         <spacer name="verticalSpacer_4">
          <property name="orientation">
           <enum>Qt::Vertical</enum>
@@ -2109,7 +2109,7 @@
          </property>
         </spacer>
        </item>
-       <item row="7" column="3">
+       <item row="8" column="3">
         <spacer name="verticalSpacer_9">
          <property name="orientation">
           <enum>Qt::Vertical</enum>
@@ -2125,7 +2125,7 @@
          </property>
         </spacer>
        </item>
-       <item row="8" column="0">
+       <item row="9" column="0">
         <spacer name="horizontalSpacer_10">
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
@@ -2138,7 +2138,7 @@
          </property>
         </spacer>
        </item>
-       <item row="8" column="1">
+       <item row="9" column="1">
         <widget class="QCheckBox" name="enable_fsplevel">
          <property name="toolTip">
           <string>KWin tries to prevent windows from taking the focus
@@ -2152,7 +2152,7 @@
          </property>
         </widget>
        </item>
-       <item row="8" column="2" colspan="3">
+       <item row="9" column="2" colspan="3">
         <widget class="QComboBox" name="rule_fsplevel">
          <property name="enabled">
           <bool>false</bool>
@@ -2174,7 +2174,7 @@
          </item>
         </widget>
        </item>
-       <item row="8" column="5">
+       <item row="9" column="5">
         <widget class="KComboBox" name="fsplevel">
          <property name="enabled">
           <bool>false</bool>
@@ -2206,7 +2206,7 @@
          </item>
         </widget>
        </item>
-       <item row="8" column="6">
+       <item row="9" column="6">
         <spacer name="horizontalSpacer_4">
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
@@ -2219,7 +2219,7 @@
          </property>
         </spacer>
        </item>
-       <item row="9" column="1">
+       <item row="10" column="1">
         <widget class="QCheckBox" name="enable_fpplevel">
          <property name="toolTip">
           <string>This controls the focus protection of the currently active window.
@@ -2233,7 +2233,7 @@
          </property>
         </widget>
        </item>
-       <item row="9" column="2" colspan="3">
+       <item row="10" column="2" colspan="3">
         <widget class="QComboBox" name="rule_fpplevel">
          <property name="enabled">
           <bool>false</bool>
@@ -2255,7 +2255,7 @@
          </item>
         </widget>
        </item>
-       <item row="9" column="5">
+       <item row="10" column="5">
         <widget class="KComboBox" name="fpplevel">
          <property name="enabled">
           <bool>false</bool>
@@ -2287,7 +2287,7 @@
          </item>
         </widget>
        </item>
-       <item row="10" column="1">
+       <item row="11" column="1">
         <widget class="QCheckBox" name="enable_acceptfocus">
          <property name="toolTip">
           <string>Windows may prevent to get the focus (activate) when being clicked.
@@ -2299,7 +2299,7 @@
          </property>
         </widget>
        </item>
-       <item row="10" column="2" colspan="3">
+       <item row="11" column="2" colspan="3">
         <widget class="QComboBox" name="rule_acceptfocus">
          <property name="enabled">
           <bool>false</bool>
@@ -2321,14 +2321,14 @@
          </item>
         </widget>
        </item>
-       <item row="10" column="5">
+       <item row="11" column="5">
         <widget class="YesNoBox" name="acceptfocus" native="true">
          <property name="enabled">
           <bool>false</bool>
          </property>
         </widget>
        </item>
-       <item row="11" column="1">
+       <item row="12" column="1">
         <widget class="QCheckBox" name="enable_disableglobalshortcuts">
          <property name="toolTip">
           <string>When used, a window will receive
@@ -2348,7 +2348,7 @@
          </property>
         </widget>
        </item>
-       <item row="11" column="2" colspan="3">
+       <item row="12" column="2" colspan="3">
         <widget class="QComboBox" name="rule_disableglobalshortcuts">
          <property name="enabled">
           <bool>false</bool>
@@ -2370,28 +2370,28 @@
          </item>
         </widget>
        </item>
-       <item row="11" column="5">
+       <item row="12" column="5">
         <widget class="YesNoBox" name="disableglobalshortcuts" native="true">
          <property name="enabled">
           <bool>false</bool>
          </property>
         </widget>
        </item>
-       <item row="12" column="1" colspan="5">
+       <item row="13" column="1" colspan="5">
         <widget class="Line" name="line_6">
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
          </property>
         </widget>
        </item>
-       <item row="13" column="1">
+       <item row="14" column="1">
         <widget class="QCheckBox" name="enable_closeable">
          <property name="text">
           <string>&amp;Closeable</string>
          </property>
         </widget>
        </item>
-       <item row="13" column="2" colspan="3">
+       <item row="14" column="2" colspan="3">
         <widget class="QComboBox" name="rule_closeable">
          <property name="enabled">
           <bool>false</bool>
@@ -2413,21 +2413,21 @@
          </item>
         </widget>
        </item>
-       <item row="13" column="5">
+       <item row="14" column="5">
         <widget class="YesNoBox" name="closeable" native="true">
          <property name="enabled">
           <bool>false</bool>
          </property>
         </widget>
        </item>
-       <item row="14" column="1">
+       <item row="15" column="1">
         <widget class="QCheckBox" name="enable_type">
          <property name="text">
           <string>Window &amp;type</string>
          </property>
         </widget>
        </item>
-       <item row="14" column="2" colspan="3">
+       <item row="15" column="2" colspan="3">
         <widget class="QComboBox" name="rule_type">
          <property name="enabled">
           <bool>false</bool>
@@ -2449,7 +2449,7 @@
          </item>
         </widget>
        </item>
-       <item row="14" column="5">
+       <item row="15" column="5">
         <widget class="QComboBox" name="type">
          <property name="enabled">
           <bool>false</bool>
@@ -2501,7 +2501,7 @@
          </item>
         </widget>
        </item>
-       <item row="15" column="1">
+       <item row="16" column="1">
         <widget class="QCheckBox" name="enable_desktopfile">
          <property name="text">
           <string>Desktop file name</string>
@@ -2511,7 +2511,7 @@
          </property>
         </widget>
        </item>
-       <item row="15" column="2" colspan="3">
+       <item row="16" column="2" colspan="3">
         <widget class="QComboBox" name="rule_desktopfile">
          <property name="enabled">
           <bool>false</bool>
@@ -2548,7 +2548,7 @@
          </item>
         </widget>
        </item>
-       <item row="15" column="5">
+       <item row="16" column="5">
         <widget class="QLineEdit" name="desktopfile">
          <property name="enabled">
           <bool>false</bool>
@@ -2558,21 +2558,21 @@
          </property>
         </widget>
        </item>
-       <item row="16" column="1" colspan="5">
+       <item row="17" column="1" colspan="5">
         <widget class="Line" name="line_7">
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
          </property>
         </widget>
        </item>
-       <item row="17" column="1">
+       <item row="18" column="1">
         <widget class="QCheckBox" name="enable_blockcompositing">
          <property name="text">
           <string>Block compositing</string>
          </property>
         </widget>
        </item>
-       <item row="17" column="2" colspan="3">
+       <item row="18" column="2" colspan="3">
         <widget class="QComboBox" name="rule_blockcompositing">
          <property name="enabled">
           <bool>false</bool>
@@ -2594,14 +2594,14 @@
          </item>
         </widget>
        </item>
-       <item row="17" column="5">
+       <item row="18" column="5">
         <widget class="YesNoBox" name="blockcompositing" native="true">
          <property name="enabled">
           <bool>false</bool>
          </property>
         </widget>
        </item>
-       <item row="18" column="2">
+       <item row="19" column="2">
         <spacer name="verticalSpacer_5">
          <property name="orientation">
           <enum>Qt::Vertical</enum>
@@ -2614,6 +2614,42 @@
          </property>
         </spacer>
        </item>
+       <item row="6" column="1">
+        <widget class="QCheckBox" name="enable_blur">
+         <property name="text">
+          <string>Blur</string>
+         </property>
+        </widget>
+       </item>
+       <item row="6" column="2" colspan="3">
+        <widget class="QComboBox" name="rule_blur">
+         <property name="enabled">
+          <bool>false</bool>
+         </property>
+         <item>
+          <property name="text">
+           <string>Do Not Affect</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>Force</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>Force Temporarily</string>
+          </property>
+         </item>
+        </widget>
+       </item>
+       <item row="6" column="5">
+        <widget class="YesNoBox" name="blur" native="true">
+         <property name="enabled">
+          <bool>false</bool>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
     </widget>
@@ -2621,16 +2657,16 @@
   </layout>
  </widget>
  <customwidgets>
-  <customwidget>
-   <class>KLineEdit</class>
-   <extends>QLineEdit</extends>
-   <header>klineedit.h</header>
-  </customwidget>
   <customwidget>
    <class>KComboBox</class>
    <extends>QComboBox</extends>
    <header>kcombobox.h</header>
   </customwidget>
+  <customwidget>
+   <class>KLineEdit</class>
+   <extends>QLineEdit</extends>
+   <header>klineedit.h</header>
+  </customwidget>
   <customwidget>
    <class>YesNoBox</class>
    <extends>QWidget</extends>
diff --git a/rules.h b/rules.h
--- a/rules.h
+++ b/rules.h
@@ -62,6 +62,7 @@
     QSize checkMaxSize(QSize s) const;
     int checkOpacityActive(int s) const;
     int checkOpacityInactive(int s) const;
+    bool checkBlur(bool) const;
     bool checkIgnoreGeometry(bool ignore, bool init = false) const;
     int checkDesktop(int desktop, bool init = false) const;
     int checkScreen(int screen, bool init = false) const;
@@ -110,7 +111,8 @@
         Shade = 1<<6, SkipTaskbar = 1<<7, SkipPager = 1<<8,
         SkipSwitcher = 1<<9, Above = 1<<10, Below = 1<<11, Fullscreen = 1<<12,
         NoBorder = 1<<13, OpacityActive = 1<<14, OpacityInactive = 1<<15,
-        Activity = 1<<16, Screen = 1<<17, DesktopFile = 1 << 18, All = 0xffffffff
+        Activity = 1<<16, Screen = 1<<17, DesktopFile = 1 << 18, Blur = 1 << 19,
+        All = 0xffffffff
     };
     Q_DECLARE_FLAGS(Types, Type)
     void write(KConfigGroup&) const;
@@ -130,6 +132,7 @@
     bool applyMaxSize(QSize& s) const;
     bool applyOpacityActive(int& s) const;
     bool applyOpacityInactive(int& s) const;
+    bool applyBlur(bool& s) const;
     bool applyIgnoreGeometry(bool& ignore, bool init) const;
     bool applyDesktop(int& desktop, bool init) const;
     bool applyScreen(int& desktop, bool init) const;
@@ -229,6 +232,8 @@
     ForceRule opacityactiverule;
     int opacityinactive;
     ForceRule opacityinactiverule;
+    bool blur;
+    ForceRule blurrule;
     bool ignoregeometry;
     SetRule ignoregeometryrule;
     int desktop;
diff --git a/rules.cpp b/rules.cpp
--- a/rules.cpp
+++ b/rules.cpp
@@ -29,6 +29,8 @@
 #include <QFileInfo>
 #include <QDebug>
 
+#include <KWindowEffects>
+
 #ifndef KCMRULES
 #include "client.h"
 #include "client_machine.h"
@@ -54,6 +56,7 @@
     , maxsizerule(UnusedForceRule)
     , opacityactiverule(UnusedForceRule)
     , opacityinactiverule(UnusedForceRule)
+    , blurrule(UnusedForceRule)
     , ignoregeometryrule(UnusedSetRule)
     , desktoprule(UnusedSetRule)
     , screenrule(UnusedSetRule)
@@ -163,6 +166,7 @@
     READ_FORCE_RULE(opacityinactive, , 0);
     if (opacityinactive < 0 || opacityinactive > 100)
         opacityinactive = 100;
+    READ_FORCE_RULE(blur, ,false);
     READ_SET_RULE(ignoregeometry, , false);
     READ_SET_RULE(desktop, , 0);
     READ_SET_RULE(screen, , 0);
@@ -257,6 +261,7 @@
     WRITE_FORCE_RULE(maxsize,);
     WRITE_FORCE_RULE(opacityactive,);
     WRITE_FORCE_RULE(opacityinactive,);
+    WRITE_FORCE_RULE(blur,);
     WRITE_SET_RULE(ignoregeometry,);
     WRITE_SET_RULE(desktop,);
     WRITE_SET_RULE(screen,);
@@ -309,6 +314,7 @@
            && maxsizerule == UnusedForceRule
            && opacityactiverule == UnusedForceRule
            && opacityinactiverule == UnusedForceRule
+           && blurrule == UnusedForceRule
            && ignoregeometryrule == UnusedSetRule
            && desktoprule == UnusedSetRule
            && screenrule == UnusedSetRule
@@ -618,6 +624,7 @@
 APPLY_FORCE_RULE(maxsize, MaxSize, QSize)
 APPLY_FORCE_RULE(opacityactive, OpacityActive, int)
 APPLY_FORCE_RULE(opacityinactive, OpacityInactive, int)
+APPLY_FORCE_RULE(blur, Blur, bool)
 APPLY_RULE(ignoregeometry, IgnoreGeometry, bool)
 
 APPLY_RULE(desktop, Desktop, int)
@@ -718,6 +725,7 @@
     DISCARD_USED_FORCE_RULE(maxsize);
     DISCARD_USED_FORCE_RULE(opacityactive);
     DISCARD_USED_FORCE_RULE(opacityinactive);
+    DISCARD_USED_FORCE_RULE(blur);
     DISCARD_USED_SET_RULE(ignoregeometry);
     DISCARD_USED_SET_RULE(desktop);
     DISCARD_USED_SET_RULE(screen);
@@ -833,6 +841,7 @@
 CHECK_FORCE_RULE(MaxSize, QSize)
 CHECK_FORCE_RULE(OpacityActive, int)
 CHECK_FORCE_RULE(OpacityInactive, int)
+CHECK_FORCE_RULE(Blur, bool)
 CHECK_RULE(IgnoreGeometry, bool)
 
 CHECK_RULE(Desktop, int)
@@ -945,6 +954,7 @@
     // StrictGeometry
     setShortcut(rules()->checkShortcut(shortcut().toString()));
     // see also Client::setActive()
+    KWindowEffects::enableBlurBehind(window(), client_rules->checkBlur(false));
     if (isActive()) {
         setOpacity(rules()->checkOpacityActive(qRound(opacity() * 100.0)) / 100.0);
         workspace()->disableGlobalShortcutsForClient(rules()->checkDisableGlobalShortcuts(false));