avoid rebuilding firefox

hardware/gpu/cuda-common.nix

@@ -21,11 +21,7 @@ lib.mkMerge [
 })
 {
 
-  nixpkgs.config.openglSupport = true; # why is this not set by hardware.opengl.enable ?
-  nixpkgs.config.cudaSupport   = true;
-  nixpkgs.config.vdpauSupport  = true;
-  nixpkgs.config.vaapiSupport  = true;
-  nixpkgs.config.nvidiaSupport = true;
+  nixpkgs.config.cudaSupport= true;
 
   nixpkgs.config.allowUnfreePredicate =
     pkg:
@@ -39,6 +35,16 @@ lib.mkMerge [
       (lib.hasInfix "cublas" pkgname)
     ];
 
+  # avoid expensive rebuilds
+  nixpkgs.config.packageOverrides = pkgs: {
+    firefox-unwrapped = pkgs.firefox-unwrapped.override (old: {
+      onnxruntime = old.onnxruntime.override {
+        cudaSupport = false;
+        ncclSupport = false;
+      };
+    });
+  };
+
 }
 /* lib.mkIf (lib.versionAtLeast lib.version "24.11") { */
 (lib.optionalAttrs (lib.versionAtLeast lib.version "24.11") {