diff --git a/ajax_facets.info b/ajax_facets.info
index 81b9436..e9d2b82 100644
--- a/ajax_facets.info
+++ b/ajax_facets.info
@@ -3,6 +3,7 @@ description = Ajax facet filters.
 dependencies[] = facetapi
 dependencies[] = search_api
 dependencies[] = views
+dependencies[] = libraries
 package = Search Toolkit
 core = 7.x
 
diff --git a/ajax_facets.install b/ajax_facets.install
index e69de29..277d589 100644
--- a/ajax_facets.install
+++ b/ajax_facets.install
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * @file
+ * ajax_facets.install file.
+ */
+
+/**
+ * Implements hook_requirements().
+ */
+function ajax_facets_requirements($phase) {
+  $requirements = array();
+  $t = get_t();
+
+  switch ($phase) {
+    case 'runtime':
+      if (!libraries_get_path('history.js')) {
+        $requirements['ajax_facets_error'] = array(
+          'title' => $t('Ajax Facets'),
+          'description' => $t('Please download and unpack "history.js" library to libraries directory.'),
+          'value' => l($t('Download'), 'https://github.com/browserstate/history.js/', array(
+            'attributes' => array(
+              'target' => '_blank',
+            ),
+          )),
+          'severity' => REQUIREMENT_ERROR,
+        );
+      }
+      break;
+  }
+
+  return $requirements;
+}
diff --git a/ajax_facets.module b/ajax_facets.module
index e160e9a..8d2bfd6 100644
--- a/ajax_facets.module
+++ b/ajax_facets.module
@@ -95,6 +95,7 @@ function ajax_facets_add_ajax_js($facet) {
     $included = TRUE;
     $module_path = drupal_get_path('module', 'ajax_facets');
     drupal_add_js($module_path . '/misc/ajax_facets.js');
+    drupal_add_js(libraries_get_path('history.js') . '/scripts/bundled/html4+html5/jquery.history.js', array('group' => JS_LIBRARY));
     drupal_add_css($module_path . '/misc/ajax_facets.css');
     $search_path = $facet->getAdapter()->getSearchPath();
     $filter_key = $facet->getAdapter()->getUrlProcessor()->getFilterKey();
diff --git a/misc/ajax_facets.js b/misc/ajax_facets.js
index 731d72c..7dc5b3a 100644
--- a/misc/ajax_facets.js
+++ b/misc/ajax_facets.js
@@ -8,6 +8,8 @@
   Drupal.ajax_facets.queryState = null;
   // State of each facet.
   Drupal.ajax_facets.facetQueryState = null;
+  // Determine if it is first page load. Will be reset in Drupal.ajax_facets.initHistoryState.
+  Drupal.ajax_facets.firstLoad = true;
   // HTML ID of element of current facet.
   Drupal.ajax_facets.current_id = null;
   // Current changed facet.
@@ -185,7 +187,7 @@
       var $facet = $(this).parent().find('[data-facet]').first();
       var facetName = $facet.data('facet');
       Drupal.ajax_facets.excludeCurrentFacet(facetName);
-      Drupal.ajax_facets.sendAjaxQuery($facet);
+      Drupal.ajax_facets.sendAjaxQuery($facet, true);
       event.preventDefault();
     });
   };
@@ -197,6 +199,9 @@
 
     var $this = $(this);
     var facetName = $this.data('facet');
+
+    Drupal.ajax_facets.initHistoryState($this);
+
     if (Drupal.ajax_facets.queryState['f'] != undefined) {
       // Exclude all values for this facet from query.
       Drupal.ajax_facets.excludeCurrentFacet(facetName);
@@ -210,7 +215,7 @@
       }
     }
 
-    Drupal.ajax_facets.sendAjaxQuery($this);
+    Drupal.ajax_facets.sendAjaxQuery($this, true);
   };
 
   /**
@@ -219,6 +224,9 @@
   Drupal.ajax_facets.processCheckboxes = function (event) {
     var $this = $(this);
     var facetName = $this.data('facet');
+
+    Drupal.ajax_facets.initHistoryState($this);
+
     var facetCheckboxName = $this.attr('name');
     if (Drupal.ajax_facets.queryState['f'] != undefined) {
       var queryNew = new Array();
@@ -250,7 +258,7 @@
       }
     }
 
-    Drupal.ajax_facets.sendAjaxQuery($this);
+    Drupal.ajax_facets.sendAjaxQuery($this, true);
   };
 
   /**
@@ -260,6 +268,9 @@
     var $this = $(this);
     var facetName = $this.data('facet');
     var name_value = $this.data('name') + ':' + $this.data('value');
+
+    Drupal.ajax_facets.initHistoryState($this);
+
     if (Drupal.ajax_facets.queryState['f'] != undefined) {
       var queryNew = new Array();
       /* Handle value - deactivate. */
@@ -289,7 +300,7 @@
       }
     }
 
-    Drupal.ajax_facets.sendAjaxQuery($this);
+    Drupal.ajax_facets.sendAjaxQuery($this, true);
     event.preventDefault();
   };
 
@@ -297,6 +308,7 @@
    * Callback for slide event for widget ranges.
    */
   Drupal.ajax_facets.processSlider = function($sliderWrapper, min, max) {
+    Drupal.ajax_facets.initHistoryState($sliderWrapper);
     window.clearTimeout(Drupal.ajax_facets.timer);
     Drupal.ajax_facets.timer = window.setTimeout(function() {
       var facetName = $sliderWrapper.data('facet');
@@ -306,7 +318,7 @@
         Drupal.ajax_facets.queryState['f'][Drupal.ajax_facets.queryState['f'].length] = facetName + ':[' + min + ' TO ' + max + ']';
       }
 
-      Drupal.ajax_facets.sendAjaxQuery($sliderWrapper);
+      Drupal.ajax_facets.sendAjaxQuery($sliderWrapper, true);
     }, 600);
   }
 
@@ -327,7 +339,7 @@
   /**
    * Send ajax.
    */
-  Drupal.ajax_facets.sendAjaxQuery = function ($this) {
+  Drupal.ajax_facets.sendAjaxQuery = function ($this, pushStateNeeded) {
     Drupal.ajax_facets.current_id = $this.attr('id');
     Drupal.ajax_facets.current_facet_name = $this.data('facet');
     Drupal.ajax_facets.beforeAjax();
@@ -343,6 +355,22 @@
       submit : {'ajax_facets' : data}
     };
     var ajax = new Drupal.ajax(false, false, settings);
+    ajax.success = function(response, status) {
+      // Push new state only on successful ajax response.
+      if (pushStateNeeded) {
+        var stateUrl = Drupal.settings.basePath + Drupal.settings.pathPrefix + Drupal.settings.facetapi.searchPath + '?' + Drupal.ajax_facets.getFacetsQuery(),
+          state = {
+            current_id: Drupal.ajax_facets.current_id,
+            current_facet_name: Drupal.ajax_facets.current_facet_name,
+            facets: Drupal.ajax_facets.queryState['f']
+          };
+
+        Drupal.ajax_facets.pushState(state, document.title, stateUrl);
+      }
+
+      //Pass back to original method.
+      Drupal.ajax.prototype.success.call(this, response, status);
+    };
     ajax.eventResponse(ajax, {});
   },
 
@@ -464,4 +492,79 @@
       }
     }
   }
+
+  /**
+   * Returns query string with selected facets.
+   */
+  Drupal.ajax_facets.getFacetsQuery = function() {
+    var query = {
+      'f': Drupal.ajax_facets.queryState.f
+    };
+
+    if (Drupal.ajax_facets.queryState.query) {
+      query.query = Drupal.ajax_facets.queryState.query;
+    }
+
+    if (Drupal.ajax_facets.queryState.order) {
+      query.order = Drupal.ajax_facets.queryState.order;
+      query.sort = Drupal.ajax_facets.queryState.sort;
+    }
+
+    if (Drupal.ajax_facets.queryState.pages) {
+      query.pages = Drupal.ajax_facets.queryState.pages;
+    }
+
+    return decodeURIComponent($.param(query));
+  };
+
+  /**
+   * Initialize the history state. We only want to do this on the initial page
+   * load but we can't call it until after a facet has been clicked because we
+   * need to communicate which one is being "deactivated" for our ajax success
+   * handler.
+   */
+  Drupal.ajax_facets.initHistoryState = function ($facet) {
+    // Set the initial state only initial page load.
+    if (Drupal.ajax_facets.firstLoad) {
+      History.replaceState({
+        current_id: $facet.attr('id'),
+        current_facet_name: $facet.data('facet'),
+        facets: Drupal.ajax_facets.queryState['f']
+      }, null, null);
+      Drupal.ajax_facets.firstLoad = false;
+    }
+  };
+
+  /**
+   * Pushes new state to browser history.
+   *
+   * History.js library fires "statechange" event even on API push/replace calls.
+   * So before pushing new state to history we should unbind from this event and after bin again.
+   */
+  Drupal.ajax_facets.pushState = function (state, title, stateUrl) {
+    var $window = $(window);
+
+    $window.unbind('statechange', Drupal.ajax_facets.reactOnStateChange);
+    History.pushState(state, title, stateUrl);
+    $window.bind('statechange', Drupal.ajax_facets.reactOnStateChange);
+  };
+
+  /**
+   * Callback for back/forward browser buttons.
+   */
+  Drupal.ajax_facets.reactOnStateChange = function () {
+    var state = History.getState();
+
+    Drupal.ajax_facets.queryState['f'] = state.data.facets;
+    Drupal.ajax_facets.sendAjaxQuery($('#' + state.data.current_id), false);
+  };
+
+  /**
+   * Initial bind to statechange event.
+   */
+  History.Adapter.bind(window, 'statechange', function () {
+    if (Drupal.ajax_facets.firstLoad) {
+      Drupal.ajax_facets.reactOnStateChange();
+    }
+  });
 })(jQuery);