diff --git a/zen-hide-sidebar/README.md b/zen-hide-sidebar/README.md
index cbaa4c1..2e4d82e 100644
--- a/zen-hide-sidebar/README.md
+++ b/zen-hide-sidebar/README.md
@@ -24,3 +24,4 @@ Tips:
 3.  For quick style previews, utilize the `Style Editor`.
 4.  Customize navigation and sidebar colors via `about:config -> zen.theme.gradient.show-custom-colors -> true`.
 5.  Disable transparent backgrounds: `about:config -> transparent -> false`.
+4. `zen.theme.gradient` 
\ No newline at end of file
diff --git a/zen-hide-sidebar/chrome.css b/zen-hide-sidebar/chrome.css
index 1cc96b1..aec73e3 100644
--- a/zen-hide-sidebar/chrome.css
+++ b/zen-hide-sidebar/chrome.css
@@ -1,14 +1,14 @@
-/* hide sidebar mod */
+/* hide sidebar theme */
 
 /* hide Sidebery header */
-@media (-moz-bool-pref: "mod.hidesidebar.hide_sidebar_header") {
+@media (-moz-bool-pref: "theme.hidesidebar.hide_sidebar_header") {
   #sidebar-header {
     display: none !important;
   }
 }
 
 /* hide default sidebar */
-@media (-moz-bool-pref: "mod.hidesidebar.hide_navigator_toolbox") {
+@media (-moz-bool-pref: "theme.hidesidebar.hide_navigator_toolbox") {
   #navigator-toolbox {
     display: none !important;
   }
diff --git a/zen-hide-sidebar/image.png b/zen-hide-sidebar/image.png
index 4804261..6909d23 100644
Binary files a/zen-hide-sidebar/image.png and b/zen-hide-sidebar/image.png differ
diff --git a/zen-hide-sidebar/preferences.json b/zen-hide-sidebar/preferences.json
index bc97bc2..b113951 100644
--- a/zen-hide-sidebar/preferences.json
+++ b/zen-hide-sidebar/preferences.json
@@ -1,14 +1,14 @@
 [
   {
-    "property": "mod.hidesidebar.hide_sidebar_header",
+    "property": "theme.hidesidebar.hide_sidebar_header",
     "label": "hide Sidebery header",
     "type": "checkbox",
-    "defaultValue": true
+    "defaultValue": false
   },
   {
-    "property": "mod.hidesidebar.hide_navigator_toolbox",
+    "property": "theme.hidesidebar.hide_navigator_toolbox",
     "label": "hide default sidebar",
     "type": "checkbox",
-    "defaultValue": true
+    "defaultValue": false
   }
 ]