diff --git a/modules/home-manager/web/firefox/conf/theme.nix b/modules/home-manager/web/firefox/conf/theme.nix
index 94e8e94..4f61bfe 100644
--- a/modules/home-manager/web/firefox/conf/theme.nix
+++ b/modules/home-manager/web/firefox/conf/theme.nix
@@ -11,7 +11,7 @@
   "browser.newtabpage.activity-stream.showSponsoredTopSites" = false;
   "browser.newtabpage.activity-stream.showSponsored" = false;
 
-# Mozilla messages and recommandations
+# Mozilla messages and recommendations
   "browser.messaging-system.whatsNewPanel.enabled" = false;
   "browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons" = false;
   "browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features" = false;
@@ -22,15 +22,50 @@
   "signon.rememberSignons" = false;
 
 # do not override status page
- "startup.homepage_override_url" = "";
- "startup.homepage_welcome_url" = "";
+  "startup.homepage_override_url" = "";
+  "startup.homepage_welcome_url" = "";
 
 # do not show bookmark page
- "browser.toolbars.bookmarks.visibility" = "never";
+  "browser.toolbars.bookmarks.visibility" = "never";
 
-# disable funsking malwares
- "browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts.havePinned" = "";
- "browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts.searchEngines" = "";
- "browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts" = false;
- "browser.newtabpage.pinned" = "";
+# disable fucking included malwares
+  "browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts.havePinned" = "";
+  "browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts.searchEngines" = "";
+  "browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts" = false;
+  "browser.newtabpage.pinned" = "";
+
+# Theme customization
+  "browser.uiCustomization.state" = builtins.toJSON {
+    currentVersion = 20;
+    newElementCount = 4;
+    dirtyAreaCache = ["nav-bar" "PersonalToolbar" "toolbar-menubar" "TabsToolbar" "widget-overflow-fixed-list"];
+    placements = {
+      PersonalToolbar = [];
+      TabsToolbar = [
+        "tabbrowser-tabs"
+        "ublock0_raymondhill_net-browser-action"
+        "addon_darkreader_org-browser-action"
+        "cookieautodelete_kennydo_com-browser-action"
+        "jid1-mnnxcxisbpnsxq_jetpack-browser-action"
+        "downloads-button"
+      ];
+      nav-bar = [
+        "back-button"
+        "forward-button"
+        "stop-reload-button"
+        "urlbar-container"
+        "unified-extensions-button"
+      ];
+      toolbar-menubar = ["menubar-items"];
+      unified-extensions-area = [
+        "browserpass_maximbaz_com-browser-action"
+        "gdpr_cavi_au_dk-browser-action"
+        "cookieautodelete_kennydo_com-browser-action"
+        "addon_darkreader_org-browser-action"
+        "jid1-bofifl9vbdl2zq_jetpack-browser-action"
+      ];
+      widget-overflow-fixed-list = [];
+    };
+    seen = ["save-to-pocket-button" "developer-button" "ublock0_raymondhill_net-browser-action" "_testpilot-containers-browser-action"];
+  };
 }