diff --git a/NEWS b/NEWS
index 3a17ee96..952fab9a 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,7 @@
       special versions for the old behavior
     * IMPORTANT: renamed Startup and Quit autocmd events to VimperatorEnter and
       VimperatorLeave respectively
+    * add 'Fullscreen' autocommmand
     * add :colorscheme
     * multibyte support for hints (thanks Xie&Tian)
     * add 'exrc'
diff --git a/content/buffer.js b/content/buffer.js
index 27432c87..c01d8c65 100644
--- a/content/buffer.js
+++ b/content/buffer.js
@@ -133,11 +133,7 @@ function Buffer() //{{{
         "Show the current window fullscreen",
         "boolean", false,
         {
-            setter: function (value)
-            {
-                window.fullScreen = value;
-                return value;
-            },
+            setter: function (value) window.fullScreen = value,
             getter: function () window.fullScreen
         });
 
diff --git a/content/events.js b/content/events.js
index 721631e1..8c8dc07a 100644
--- a/content/events.js
+++ b/content/events.js
@@ -269,6 +269,8 @@ function Events() //{{{
 
     const input = liberator.input;
 
+    var fullscreen = window.fullScreen;
+
     var inputBufferLength = 0; // count the number of keys in v.input.buffer (can be different from v.input.buffer.length)
     var skipMap = false; // while feeding the keys (stored in v.input.buffer | no map found) - ignore mappings
 
@@ -360,6 +362,7 @@ function Events() //{{{
     window.addEventListener("popuphidden", exitPopupMode, true);
     window.addEventListener("DOMMenuBarActive", enterMenuMode, true);
     window.addEventListener("DOMMenuBarInactive", exitMenuMode, true);
+    window.addEventListener("resize", onResize, true);
 
     // window.document.addEventListener("DOMTitleChanged", function (event)
     // {
@@ -469,6 +472,16 @@ function Events() //{{{
         autocommands.trigger(name, args);
     }
 
+    function onResize(event)
+    {
+        if (window.fullScreen != fullscreen)
+        {
+            fullscreen = window.fullScreen;
+            liberator.triggerObserver("fullscreen", fullscreen);
+            autocommands.trigger("Fullscreen", {url: "", fullscreen: fullscreen});
+        }
+    }
+
     function onDOMContentLoaded(event)
     {
         if (event.originalTarget instanceof HTMLDocument)
diff --git a/content/vimperator.js b/content/vimperator.js
index bdd92a7c..31d76900 100644
--- a/content/vimperator.js
+++ b/content/vimperator.js
@@ -43,6 +43,7 @@ const config = { //{{{
                    ["ColorScheme",        "Triggered after a color scheme has been loaded"],
                    ["DOMLoad",            "Triggered when a page's DOM content has fully loaded"],
                    ["DownloadPost",       "Triggered when a download has completed"],
+                   ["Fullscreen",         "Triggered when the browser's fullscreen state changes"],
                    ["LocationChange",     "Triggered when changing tabs or when naviagtion to a new location"],
                    ["PageLoadPre",        "Triggered after a page load is initiated"],
                    ["PageLoad",           "Triggered when a page gets (re)loaded/opened"],
diff --git a/locale/en-US/autocommands.txt b/locale/en-US/autocommands.txt
index 3cb36bd9..15978581 100644
--- a/locale/en-US/autocommands.txt
+++ b/locale/en-US/autocommands.txt
@@ -24,6 +24,7 @@ Available {events}:
 *ColorScheme*        Triggered after a color scheme has been loaded
 *DOMLoad*            Triggered when a page's DOM content has fully loaded
 *DownloadPost*       Triggered when a download has completed
+*Fullscreen*         Triggered when the browser's fullscreen state changes
 *LocationChange*     Triggered when changing tabs or when navigating to a new location
 *PageLoadPre*        Triggered after a page load is initiated.
 *PageLoad*           Triggered when a page gets (re)loaded/opened