diff --git a/modules/home-manager/nvim/treesitter/default.nix b/modules/home-manager/nvim/treesitter/default.nix
index 080fbd2..a92d22a 100644
--- a/modules/home-manager/nvim/treesitter/default.nix
+++ b/modules/home-manager/nvim/treesitter/default.nix
@@ -28,6 +28,15 @@
           })
         '';
         keymaps = [
+          {
+            action = ":TSContextToggle<CR>";
+            key = "<leader>x";
+            mode = "n";
+            options = {
+              silent = true;
+              desc = "tree context toggle";
+            };
+          }
           {
             action = ":TSJToggle<CR>";
             key = "<leader>j";
diff --git a/packages/aarch64-iso.nix b/packages/aarch64-iso.nix
index 1b59e18..c145555 100644
--- a/packages/aarch64-iso.nix
+++ b/packages/aarch64-iso.nix
@@ -47,7 +47,7 @@
       users.users.${config.host.user} = {
         packages = with pkgs; [
           gparted
-          firefox
+          neovim
         ];
       };
 
@@ -116,17 +116,6 @@
       # plenty of free memory.
       boot.kernel.sysctl."vm.overcommit_memory" = "1";
 
-      # To speed up installation a little bit, include the complete
-      # stdenv in the Nix store on the CD.
-      system.extraDependencies = with pkgs; [
-        stdenv
-        stdenvNoCC # for runCommand
-        busybox
-        jq # for closureInfo
-        # For boot.initrd.systemd
-        makeInitrdNGTool
-      ];
-
       # Show all debug messages from the kernel but don't log refused packets
       # because we have the firewall enabled. This makes installs from the
       # console less cumbersome if the machine has a public IP.