diff --git a/firefox.nix b/firefox.nix
index 85bd2c5..8d4f0e6 100644
--- a/firefox.nix
+++ b/firefox.nix
@@ -1,8 +1,14 @@
-{ user, ... }:
+{ pkgs, user, ... }:
 
 let
   startpageDir = import ./startpage/dir.nix;
   startpage = "file:///home/${user}/${startpageDir}/index.html";
+  firefox-csshacks = pkgs.fetchFromGitHub {
+    owner = "MrOtherGuy";
+    repo = "firefox-csshacks";
+    rev = "76867a5f570319d1bfd8cd396c92c876450328da";
+    sha256 = "pGDnT1aRsu/06dlYtsHLkaNakfvXmQQ/SAplClyS/2c=";
+  };
 in
 {
   nixpkgs = {
@@ -42,7 +48,9 @@ in
       isDefault = true;
       settings = {
         "browser.startup.homepage" = "${startpage}";
+        "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
       };
+      userChrome = builtins.readFile "${firefox-csshacks}/chrome/autohide_toolbox.css";
     };
   };
 }