diff --git a/hosts/machine/kanade/home/default.nix b/hosts/machine/kanade/home/default.nix
index c57cb0d..33360d7 100644
--- a/hosts/machine/kanade/home/default.nix
+++ b/hosts/machine/kanade/home/default.nix
@@ -21,6 +21,7 @@
     "${inputs.self}/modules/home/devtool/neovim.nix"
     "${inputs.self}/modules/home/devtool/ghostty.nix"
     "${inputs.self}/modules/home/devtool/zed.nix"
+    "${inputs.self}/modules/home/firefox-devedition.nix"
     ./config/git.nix
     ./config/shell.nix
   ];
diff --git a/hosts/machine/kanade/modules/homebrew/casks.nix b/hosts/machine/kanade/modules/homebrew/casks.nix
index 11d6a71..08ad7f2 100644
--- a/hosts/machine/kanade/modules/homebrew/casks.nix
+++ b/hosts/machine/kanade/modules/homebrew/casks.nix
@@ -11,6 +11,9 @@
   "signal"
   "zoom"
 
+  # Browsers
+  "firefox@developer-edition"
+
   # Productivity and design
   "camo-studio"
   "proton-drive"
diff --git a/hosts/server/natsu/default.nix b/hosts/server/natsu/default.nix
index 1b29d32..90ba444 100644
--- a/hosts/server/natsu/default.nix
+++ b/hosts/server/natsu/default.nix
@@ -12,7 +12,6 @@ nixpkgs.lib.nixosSystem {
     # ./services/attic.nix
     ./services/caddy.nix
     ./services/forgejo-runner.nix
-    ./services/limbo.nix
     ./services/stream.nix
     # ./services/harmonia.nix
     ./configuration.nix
diff --git a/hosts/server/natsu/services/limbo.nix b/hosts/server/natsu/services/limbo.nix
deleted file mode 100644
index 404c5dc..0000000
--- a/hosts/server/natsu/services/limbo.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ ... }:
-
-{
-  systemd.services.limbo = {
-    description = "Minecraft Limbo Server";
-    after = [ "network-online.target" ];
-    wants = [ "network-online.target" ];
-    wantedBy = [ "multi-user.target" ];
-
-    serviceConfig = {
-      Type = "simple";
-      User = "imnyang";
-      Group = "users";
-      WorkingDirectory = "/home/imnyang/minecraft/limbo";
-      ExecStart = "/home/imnyang/minecraft/limbo/pico_limbo --config /home/imnyang/minecraft/limbo/server.toml";
-      Restart = "always";
-      RestartSec = 5;
-    };
-  };
-}
diff --git a/modules/home/firefox-devedition.nix b/modules/home/firefox-devedition.nix
index 9a5d18e..8ed8f1d 100644
--- a/modules/home/firefox-devedition.nix
+++ b/modules/home/firefox-devedition.nix
@@ -1,147 +1,258 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
 
 let
+  inherit (pkgs.stdenv.hostPlatform) isDarwin isLinux;
+
   extensionUrl = "https://git.mizuki.guru/imnyang/thisiswindowsfigma/releases/download/v1.0.0/d168a70cb6a24fe4a478-1.0.0.xpi";
   extensionId = "figma-windows-ua-spoofer@imnyang.local";
-in
-{
-  programs.firefox = {
-    enable = true;
-    package = pkgs.firefox-devedition;
 
-    policies = {
-      DisableAppUpdate = true;
-      ExtensionSettings = {
-        ${extensionId} = {
-          installation_mode = "force_installed";
-          install_url = extensionUrl;
+  profileName = "imnyang";
+  darwinProfilePath = "Profiles/${profileName}";
+
+  firefoxSettings = {
+    "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
+    "browser.uidensity" = 0;
+    "browser.theme.dark-private-windows" = false;
+  };
+
+  userChrome = ''
+    :root {
+      --mizuki-bg: #fcf8f9;
+      --mizuki-fg: #191017;
+      --mizuki-muted: #707d8a;
+      --mizuki-border: #f2e6ea;
+      --mizuki-surface: #fdf7f9;
+      --mizuki-hover: #8165700f;
+      --mizuki-active: #8165701a;
+      --mizuki-selection: #ecb7d5;
+    }
+
+    @media (prefers-color-scheme: dark) {
+      :root {
+        --mizuki-bg: #191017;
+        --mizuki-fg: #fafafa;
+        --mizuki-muted: #a9a9b1;
+        --mizuki-border: #2c1f2d;
+        --mizuki-surface: #191017;
+        --mizuki-hover: #2c1f2d80;
+        --mizuki-active: #2c1f2d;
+        --mizuki-selection: #604562;
+      }
+    }
+
+    #navigator-toolbox,
+    #TabsToolbar,
+    #nav-bar,
+    #PersonalToolbar,
+    #sidebar-box,
+    #sidebar-header {
+      background-color: var(--mizuki-bg) !important;
+      color: var(--mizuki-fg) !important;
+    }
+
+    #navigator-toolbox {
+      border-bottom: 1px solid var(--mizuki-border) !important;
+    }
+
+    #urlbar-background,
+    #searchbar {
+      background-color: var(--mizuki-surface) !important;
+      border-color: var(--mizuki-border) !important;
+      color: var(--mizuki-fg) !important;
+    }
+
+    #urlbar[focused] > #urlbar-background,
+    #searchbar:focus-within {
+      border-color: var(--mizuki-selection) !important;
+      box-shadow: 0 0 0 1px var(--mizuki-selection) !important;
+    }
+
+    .tab-background {
+      border-radius: 10px 10px 0 0 !important;
+    }
+
+    .tab-background[selected] {
+      background-color: var(--mizuki-active) !important;
+    }
+
+    .tabbrowser-tab:not([selected]):hover .tab-background,
+    toolbarbutton:hover,
+    #urlbar:hover > #urlbar-background {
+      background-color: var(--mizuki-hover) !important;
+    }
+
+    toolbarbutton[open],
+    toolbarbutton[checked],
+    toolbarbutton:active {
+      background-color: var(--mizuki-active) !important;
+    }
+
+    #TabsToolbar .tabbrowser-tab,
+    #urlbar-input,
+    #identity-icon-label,
+    toolbarbutton {
+      color: var(--mizuki-fg) !important;
+    }
+
+    .tabbrowser-tab:not([selected]) .tab-label,
+    #sidebar-title {
+      color: var(--mizuki-muted) !important;
+    }
+  '';
+
+  userContent = ''
+    @-moz-document url("about:home"), url("about:newtab"), url("about:privatebrowsing") {
+      body,
+      .outer-wrapper,
+      .activity-stream {
+        background: #fcf8f9 !important;
+        color: #191017 !important;
+      }
+
+      @media (prefers-color-scheme: dark) {
+        body,
+        .outer-wrapper,
+        .activity-stream {
+          background: #191017 !important;
+          color: #fafafa !important;
+        }
+      }
+    }
+  '';
+
+  userJs = lib.concatStringsSep "\n" (
+    lib.mapAttrsToList (name: value: ''user_pref(${builtins.toJSON name}, ${builtins.toJSON value});'') firefoxSettings
+  ) + "\n";
+in
+lib.mkMerge [
+  (lib.mkIf isLinux {
+    programs.firefox = {
+      enable = true;
+      package = pkgs.firefox-devedition;
+
+      policies = {
+        DisableAppUpdate = true;
+        ExtensionSettings = {
+          ${extensionId} = {
+            installation_mode = "force_installed";
+            install_url = extensionUrl;
+          };
         };
       };
-    };
 
-    profiles.imnyang = {
-      id = 0;
-      name = "imnyang";
-      isDefault = true;
+      profiles.${profileName} = {
+        id = 0;
+        name = profileName;
+        path = "${profileName}.default";
+        isDefault = true;
 
-      settings = {
-        "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
-        "browser.uidensity" = 0;
-        "browser.theme.dark-private-windows" = false;
+        settings = firefoxSettings;
+        inherit userChrome userContent;
       };
+    };
 
-      userChrome = ''
-        :root {
-          --mizuki-bg: #fcf8f9;
-          --mizuki-fg: #191017;
-          --mizuki-muted: #707d8a;
-          --mizuki-border: #f2e6ea;
-          --mizuki-surface: #fdf7f9;
-          --mizuki-hover: #8165700f;
-          --mizuki-active: #8165701a;
-          --mizuki-selection: #ecb7d5;
-        }
+    xdg.mimeApps.defaultApplications = {
+      "text/html" = [ "firefox-devedition.desktop" ];
+      "x-scheme-handler/http" = [ "firefox-devedition.desktop" ];
+      "x-scheme-handler/https" = [ "firefox-devedition.desktop" ];
+      "x-scheme-handler/about" = [ "firefox-devedition.desktop" ];
+      "x-scheme-handler/unknown" = [ "firefox-devedition.desktop" ];
+    };
+  })
 
-        @media (prefers-color-scheme: dark) {
-          :root {
-            --mizuki-bg: #191017;
-            --mizuki-fg: #fafafa;
-            --mizuki-muted: #a9a9b1;
-            --mizuki-border: #2c1f2d;
-            --mizuki-surface: #191017;
-            --mizuki-hover: #2c1f2d80;
-            --mizuki-active: #2c1f2d;
-            --mizuki-selection: #604562;
-          }
-        }
+  (lib.mkIf isDarwin {
+    home.activation.configureFirefoxDeveloperEdition = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+      firefox_dir="$HOME/Library/Application Support/Firefox"
+      profiles_ini="$firefox_dir/profiles.ini"
 
-        #navigator-toolbox,
-        #TabsToolbar,
-        #nav-bar,
-        #PersonalToolbar,
-        #sidebar-box,
-        #sidebar-header {
-          background-color: var(--mizuki-bg) !important;
-          color: var(--mizuki-fg) !important;
-        }
+      mkdir -p "$firefox_dir/Profiles"
 
-        #navigator-toolbox {
-          border-bottom: 1px solid var(--mizuki-border) !important;
-        }
-
-        #urlbar-background,
-        #searchbar {
-          background-color: var(--mizuki-surface) !important;
-          border-color: var(--mizuki-border) !important;
-          color: var(--mizuki-fg) !important;
-        }
-
-        #urlbar[focused] > #urlbar-background,
-        #searchbar:focus-within {
-          border-color: var(--mizuki-selection) !important;
-          box-shadow: 0 0 0 1px var(--mizuki-selection) !important;
-        }
-
-        .tab-background {
-          border-radius: 10px 10px 0 0 !important;
-        }
-
-        .tab-background[selected] {
-          background-color: var(--mizuki-active) !important;
-        }
-
-        .tabbrowser-tab:not([selected]):hover .tab-background,
-        toolbarbutton:hover,
-        #urlbar:hover > #urlbar-background {
-          background-color: var(--mizuki-hover) !important;
-        }
-
-        toolbarbutton[open],
-        toolbarbutton[checked],
-        toolbarbutton:active {
-          background-color: var(--mizuki-active) !important;
-        }
-
-        #TabsToolbar .tabbrowser-tab,
-        #urlbar-input,
-        #identity-icon-label,
-        toolbarbutton {
-          color: var(--mizuki-fg) !important;
-        }
-
-        .tabbrowser-tab:not([selected]) .tab-label,
-        #sidebar-title {
-          color: var(--mizuki-muted) !important;
-        }
-      '';
-
-      userContent = ''
-        @-moz-document url("about:home"), url("about:newtab"), url("about:privatebrowsing") {
-          body,
-          .outer-wrapper,
-          .activity-stream {
-            background: #fcf8f9 !important;
-            color: #191017 !important;
-          }
-
-          @media (prefers-color-scheme: dark) {
-            body,
-            .outer-wrapper,
-            .activity-stream {
-              background: #191017 !important;
-              color: #fafafa !important;
+      profile_info=""
+      if [ -f "$profiles_ini" ]; then
+        profile_info=$(
+          awk '
+            function flush() {
+              if (in_profile && path != "") {
+                if (is_default == "1") {
+                  print is_relative "|" path
+                  found = 1
+                  exit
+                }
+                if (first == "") {
+                  first = is_relative "|" path
+                }
+              }
             }
-          }
-        }
+            BEGIN { in_profile = 0; is_relative = "1" }
+            /^\\[Profile[0-9]+\\]$/ { flush(); in_profile = 1; path = ""; is_default = "0"; is_relative = "1"; next }
+            /^\\[/ { flush(); in_profile = 0; next }
+            in_profile && /^Path=/ { path = substr($0, 6); next }
+            in_profile && /^Default=1$/ { is_default = "1"; next }
+            in_profile && /^IsRelative=/ { is_relative = substr($0, 12); next }
+            END {
+              if (!found) {
+                flush()
+              }
+              if (!found && first != "") {
+                print first
+              }
+            }
+          ' "$profiles_ini"
+        )
+      fi
+
+      if [ -n "$profile_info" ]; then
+        is_relative="''${profile_info%%|*}"
+        profile_path="''${profile_info#*|}"
+        if [ "$is_relative" = "1" ]; then
+          profile_dir="$firefox_dir/$profile_path"
+        else
+          profile_dir="$profile_path"
+        fi
+      else
+        profile_dir="$firefox_dir/${darwinProfilePath}"
+        cat > "$profiles_ini" <<'EOF'
+[Profile0]
+Name=${profileName}
+IsRelative=1
+Path=${darwinProfilePath}
+Default=1
+
+[General]
+StartWithLastProfile=1
+Version=2
+EOF
+      fi
+
+      mkdir -p "$profile_dir/chrome"
+      cp ${pkgs.writeText "firefox-devedition-user.js" userJs} "$profile_dir/user.js"
+      cp ${pkgs.writeText "firefox-devedition-userChrome.css" userChrome} "$profile_dir/chrome/userChrome.css"
+      cp ${pkgs.writeText "firefox-devedition-userContent.css" userContent} "$profile_dir/chrome/userContent.css"
+    '';
+
+    home.file = {
+      "Library/Preferences/org.mozilla.firefoxdeveloperedition.plist".text = ''
+        <?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+          <key>EnterprisePoliciesEnabled</key>
+          <true/>
+          <key>DisableAppUpdate</key>
+          <true/>
+          <key>ExtensionSettings</key>
+          <dict>
+            <key>${extensionId}</key>
+            <dict>
+              <key>installation_mode</key>
+              <string>force_installed</string>
+              <key>install_url</key>
+              <string>${extensionUrl}</string>
+            </dict>
+          </dict>
+        </dict>
+        </plist>
       '';
     };
-  };
-
-  xdg.mimeApps.defaultApplications = {
-    "text/html" = [ "firefox-devedition.desktop" ];
-    "x-scheme-handler/http" = [ "firefox-devedition.desktop" ];
-    "x-scheme-handler/https" = [ "firefox-devedition.desktop" ];
-    "x-scheme-handler/about" = [ "firefox-devedition.desktop" ];
-    "x-scheme-handler/unknown" = [ "firefox-devedition.desktop" ];
-  };
-}
+  })
+]