diff --git a/vimperator/AUTHORS b/vimperator/AUTHORS
index 754dc698..df9f9bc1 100644
--- a/vimperator/AUTHORS
+++ b/vimperator/AUTHORS
@@ -40,3 +40,4 @@ Patches (in no special order):
   * Dan Boger (:set online support)
   * Štěpán Němec (help copy-editing and favicon support)
   * Jarkko Oranen ('maxitems' option)
+  * Gary Katsevman ('private' option)
diff --git a/vimperator/NEWS b/vimperator/NEWS
index 6061826e..8305922d 100644
--- a/vimperator/NEWS
+++ b/vimperator/NEWS
@@ -13,6 +13,9 @@
                { arg: true, count: true, motion: true, route: true });
     * IMPORTANT: shifted key notation now matches Vim's behaviour. E.g. <C-a>
       and <C-A> are equivalent, to map the uppercase character use <C-S-A>. - Is this still true, or going to be true? --djk
+    * add 'private' - enter private browsing mode IMPORTANT: this doesn't
+      currently cause Vimperator-specific data like command-line history to be
+      purged.
     * add -description option to :command
     * command-line options are now supported via the host application's
       -liberator option
diff --git a/vimperator/content/config.js b/vimperator/content/config.js
index 18d3ab8d..aad75539 100644
--- a/vimperator/content/config.js
+++ b/vimperator/content/config.js
@@ -477,6 +477,25 @@ const config = { //{{{
                 getter: function () !services.get("io").offline
             });
 
+        // only available in FF 3.5
+        if (Ci.nsIPrivateBrowsingService)
+        {
+            services.add("privateBrowsing", "@mozilla.org/privatebrowsing;1", Ci.nsIPrivateBrowsingService);
+            options.add(["private", "pornmode"],
+                "Set the 'private browsing' option",
+                "boolean", false,
+                {
+                    setter: function (value)
+                    {
+                        return services.get("privateBrowsing").privateBrowsingEnabled = value;
+                    },
+                    getter: function ()
+                    {
+                        return services.get("privateBrowsing").privateBrowsingEnabled;
+                    }
+                });
+        }
+
         // TODO: merge with Vimperator version and add Muttator version
         // (TB handles this differently).
         options.add(["titlestring"],
diff --git a/vimperator/locale/en-US/index.txt b/vimperator/locale/en-US/index.txt
index f81dc37f..e788b1f0 100644
--- a/vimperator/locale/en-US/index.txt
+++ b/vimperator/locale/en-US/index.txt
@@ -304,6 +304,7 @@ section:Options[option-index]
 ||'pageinfo'|| Desired info on [c]:pa[geinfo][c] +
 ||'popups'|| Where to show requested popup windows +
 ||'previouspattern'|| Patterns to use when guessing the \'previous' page in a document sequence +
+||'private'|| Set the 'private browsing' option +
 ||'runtimepath'|| List of directories searched for runtime files +
 ||'scroll'|| Number of lines to scroll with [m]<C-u>[m] and [m]<C-d>[m] commands +
 ||'shell'|| Shell to use for executing [c]:![c] and [c]:run[c] commands +
diff --git a/vimperator/locale/en-US/options.txt b/vimperator/locale/en-US/options.txt
index d695d123..3f9aabd9 100644
--- a/vimperator/locale/en-US/options.txt
+++ b/vimperator/locale/en-US/options.txt
@@ -445,6 +445,21 @@ Number of Ex commands and search patterns to store in the command-line history.
 ____
 
 
+|\'noprivate'| |\'private'|
+||'private'|| boolean (default: off)
+____
+Set the 'private browsing' option. In private browsing mode history, cache
+files, cookies, form data, passwords, and download list entries are available
+only for the duration of the private browsing session and deleted when
+returning to normal browsing mode.
+
+Warning: Vimperator specific data like command-line history is not yet purged
+when exiting private browsing mode.
+
+Note: this is only available in FF 3.5.
+____
+
+
 |\'nohls'| |\'nohlsearch'| |\'hls'| |\'hlsearch'|
 ||'hlsearch' 'hls'|| boolean (default: off)
 ____