diff --git a/modules/user/modules/firefox/prefgroups.nix b/modules/user/modules/firefox/prefgroups.nix
index fe0536c..5defff9 100644
--- a/modules/user/modules/firefox/prefgroups.nix
+++ b/modules/user/modules/firefox/prefgroups.nix
@@ -22,6 +22,9 @@ rec {
       # disable plugin signing requirements
       "xpinstall.signatures.required" = false;
       "xpinstall.whitelist.required" = false;
+
+      # disable csd
+      "browser.tabs.inTitlebar" = 0;
     };
 
     security = {