diff --git a/enigma-swing/src/main/java/org/quiltmc/enigma/gui/config/Config.java b/enigma-swing/src/main/java/org/quiltmc/enigma/gui/config/Config.java
index 00b271e0b..7035e5588 100644
--- a/enigma-swing/src/main/java/org/quiltmc/enigma/gui/config/Config.java
+++ b/enigma-swing/src/main/java/org/quiltmc/enigma/gui/config/Config.java
@@ -63,6 +63,9 @@ public final class Config extends ReflectiveConfig {
 
 	public final StatsSection stats = new StatsSection();
 
+	@Comment("You shouldn't enable options in this section unless you know what you're doing")
+	public final DevSection development = new DevSection();
+
 	/**
 	 * The look and feel stored in the config: do not use this unless setting! Use {@link #activeLookAndFeel} instead,
 	 * since look and feel is final once loaded.
diff --git a/enigma-swing/src/main/java/org/quiltmc/enigma/gui/config/DevSection.java b/enigma-swing/src/main/java/org/quiltmc/enigma/gui/config/DevSection.java
new file mode 100644
index 000000000..b521f9474
--- /dev/null
+++ b/enigma-swing/src/main/java/org/quiltmc/enigma/gui/config/DevSection.java
@@ -0,0 +1,21 @@
+package org.quiltmc.enigma.gui.config;
+
+import com.google.gson.annotations.SerializedName;
+import org.quiltmc.config.api.ReflectiveConfig;
+import org.quiltmc.config.api.annotations.Processor;
+import org.quiltmc.config.api.values.TrackedValue;
+import org.quiltmc.enigma.api.source.DecompiledClassSource;
+
+public class DevSection extends ReflectiveConfig.Section {
+	@SerializedName("show_mapping_source_plugin")
+	public final TrackedValue<Boolean> showMappingSourcePlugin = this.value(false);
+
+	@SerializedName("debug_token_highlights")
+	@Processor("processDebugTokenHighlights")
+	public final TrackedValue<Boolean> debugTokenHighlights = this.value(false);
+
+	@SuppressWarnings("unused")
+	public void processDebugTokenHighlights(TrackedValue.Builder<Boolean> builder) {
+		builder.callback(trackedValue -> DecompiledClassSource.DEBUG_TOKEN_HIGHLIGHTS = trackedValue.value());
+	}
+}
diff --git a/enigma-swing/src/main/java/org/quiltmc/enigma/gui/element/MenuBar.java b/enigma-swing/src/main/java/org/quiltmc/enigma/gui/element/MenuBar.java
index b4fed2697..ba08f7e33 100644
--- a/enigma-swing/src/main/java/org/quiltmc/enigma/gui/element/MenuBar.java
+++ b/enigma-swing/src/main/java/org/quiltmc/enigma/gui/element/MenuBar.java
@@ -26,16 +26,19 @@
 import org.quiltmc.enigma.util.Pair;
 import org.quiltmc.enigma.util.validation.Message;
 import org.quiltmc.enigma.util.validation.ParameterizedMessage;
+import org.tinylog.Logger;
 
 import javax.annotation.Nullable;
 import javax.swing.ButtonGroup;
 import javax.swing.JButton;
+import javax.swing.JCheckBoxMenuItem;
 import javax.swing.JFileChooser;
 import javax.swing.JFrame;
 import javax.swing.JMenu;
 import javax.swing.JMenuBar;
 import javax.swing.JMenuItem;
 import javax.swing.JOptionPane;
+import javax.swing.JPanel;
 import javax.swing.JRadioButtonMenuItem;
 import javax.swing.JScrollPane;
 import javax.swing.JTextArea;
@@ -103,6 +106,8 @@ public class MenuBar {
 
 	// Enabled with system property "enigma.development" or "--development" flag
 	private final JMenu devMenu = new JMenu();
+	private final JCheckBoxMenuItem showMappingSourcePluginItem = new JCheckBoxMenuItem();
+	private final JCheckBoxMenuItem debugTokenHighlightsItem = new JCheckBoxMenuItem();
 	private final JMenuItem printMappingTreeItem = new JMenuItem();
 
 	private final Gui gui;
@@ -174,6 +179,8 @@ public MenuBar(Gui gui) {
 		this.helpMenu.add(this.githubItem);
 		ui.add(this.helpMenu);
 
+		this.devMenu.add(this.showMappingSourcePluginItem);
+		this.devMenu.add(this.debugTokenHighlightsItem);
 		this.devMenu.add(this.printMappingTreeItem);
 		if (System.getProperty("enigma.development", "false").equalsIgnoreCase("true")) {
 			ui.add(this.devMenu);
@@ -207,6 +214,8 @@ public MenuBar(Gui gui) {
 		this.startServerItem.addActionListener(e -> this.onStartServerClicked());
 		this.aboutItem.addActionListener(e -> AboutDialog.show(this.gui.getFrame()));
 		this.githubItem.addActionListener(e -> this.onGithubClicked());
+		this.showMappingSourcePluginItem.addActionListener(e -> this.onShowMappingSourcePluginClicked());
+		this.debugTokenHighlightsItem.addActionListener(e -> this.onDebugTokenHighlightsClicked());
 		this.printMappingTreeItem.addActionListener(e -> this.onPrintMappingTreeClicked());
 	}
 
@@ -243,6 +252,9 @@ public void updateUiState() {
 		this.exportJarItem.setEnabled(jarOpen);
 		this.statsItem.setEnabled(jarOpen);
 		this.printMappingTreeItem.setEnabled(jarOpen);
+
+		this.showMappingSourcePluginItem.setState(Config.main().development.showMappingSourcePlugin.value());
+		this.debugTokenHighlightsItem.setState(Config.main().development.debugTokenHighlights.value());
 	}
 
 	public void retranslateUi() {
@@ -292,7 +304,9 @@ public void retranslateUi() {
 		this.githubItem.setText(I18n.translate("menu.help.github"));
 
 		this.devMenu.setText("Dev");
-		this.printMappingTreeItem.setText("Print mapping tree");
+		this.showMappingSourcePluginItem.setText(I18n.translate("dev.menu.show_mapping_source_plugin"));
+		this.debugTokenHighlightsItem.setText(I18n.translate("dev.menu.debug_token_highlights"));
+		this.printMappingTreeItem.setText(I18n.translate("dev.menu.print_mapping_tree"));
 	}
 
 	private void onOpenJarClicked() {
@@ -479,22 +493,51 @@ private void onGithubClicked() {
 		GuiUtil.openUrl("https://github.com/QuiltMC/Enigma");
 	}
 
+	private void onShowMappingSourcePluginClicked() {
+		var value = this.showMappingSourcePluginItem.getState();
+		Config.main().development.showMappingSourcePlugin.setValue(value, true);
+	}
+
+	private void onDebugTokenHighlightsClicked() {
+		var value = this.debugTokenHighlightsItem.getState();
+		Config.main().development.debugTokenHighlights.setValue(value, true);
+	}
+
 	private void onPrintMappingTreeClicked() {
 		var mappings = this.gui.getController().getProject().getRemapper().getMappings();
 
-		StringWriter text = new StringWriter();
+		var text = new StringWriter();
 		EntryTreePrinter.print(new PrintWriter(text), mappings);
 
-		var frame = new JFrame("Mapping Tree");
+		var frame = new JFrame(I18n.translate("dev.mapping_tree"));
 		var pane = frame.getContentPane();
 		pane.setLayout(new BorderLayout());
 
 		var textArea = new JTextArea(text.toString());
 		textArea.setFont(ScaleUtil.getFont(Font.MONOSPACED, Font.PLAIN, 12));
 		pane.add(new JScrollPane(textArea), BorderLayout.CENTER);
-		var button = new JButton("Close");
-		button.addActionListener(e -> frame.dispose());
-		pane.add(button, BorderLayout.SOUTH);
+
+		var buttonPane = new JPanel();
+
+		var saveButton = new JButton(I18n.translate("prompt.save"));
+		saveButton.addActionListener(e -> {
+			var chooser = new JFileChooser();
+			chooser.setSelectedFile(new File("mapping_tree.txt"));
+			if (chooser.showSaveDialog(frame) == JFileChooser.APPROVE_OPTION) {
+				try {
+					Files.writeString(chooser.getSelectedFile().toPath(), text.toString());
+				} catch (IOException ex) {
+					Logger.error(ex, "Failed to save the mapping tree");
+				}
+			}
+		});
+		buttonPane.add(saveButton);
+
+		var closeButton = new JButton(I18n.translate("prompt.ok"));
+		closeButton.addActionListener(e -> frame.dispose());
+		buttonPane.add(closeButton);
+
+		pane.add(buttonPane, BorderLayout.SOUTH);
 
 		frame.setSize(ScaleUtil.getDimension(1200, 400));
 		frame.setLocationRelativeTo(this.gui.getFrame());
diff --git a/enigma-swing/src/main/java/org/quiltmc/enigma/gui/panel/IdentifierPanel.java b/enigma-swing/src/main/java/org/quiltmc/enigma/gui/panel/IdentifierPanel.java
index b4c589713..20696a766 100644
--- a/enigma-swing/src/main/java/org/quiltmc/enigma/gui/panel/IdentifierPanel.java
+++ b/enigma-swing/src/main/java/org/quiltmc/enigma/gui/panel/IdentifierPanel.java
@@ -2,6 +2,7 @@
 
 import org.quiltmc.enigma.gui.EditableType;
 import org.quiltmc.enigma.gui.Gui;
+import org.quiltmc.enigma.gui.config.Config;
 import org.quiltmc.enigma.gui.element.ConvertingTextField;
 import org.quiltmc.enigma.gui.event.ConvertingTextFieldListener;
 import org.quiltmc.enigma.gui.util.GridBagConstraintsBuilder;
@@ -150,6 +151,11 @@ public void refreshReference() {
 			} else {
 				throw new IllegalStateException("unreachable");
 			}
+
+			if (Config.main().development.showMappingSourcePlugin.value()) {
+				var mapping = this.gui.getController().getProject().getRemapper().getMapping(this.entry);
+				th.addStringRow(I18n.translate("dev.source_plugin"), mapping.sourcePluginId());
+			}
 		}
 
 		th.end();
diff --git a/enigma/src/main/java/org/quiltmc/enigma/api/source/DecompiledClassSource.java b/enigma/src/main/java/org/quiltmc/enigma/api/source/DecompiledClassSource.java
index ccfa3fc61..6d3050167 100644
--- a/enigma/src/main/java/org/quiltmc/enigma/api/source/DecompiledClassSource.java
+++ b/enigma/src/main/java/org/quiltmc/enigma/api/source/DecompiledClassSource.java
@@ -17,7 +17,7 @@
 import java.util.Map;
 
 public class DecompiledClassSource {
-	protected static final boolean DEBUG_TOKEN_HIGHLIGHTS = false;
+	public static boolean DEBUG_TOKEN_HIGHLIGHTS = false;
 
 	private final ClassEntry classEntry;
 
diff --git a/enigma/src/main/java/org/quiltmc/enigma/util/EntryTreePrinter.java b/enigma/src/main/java/org/quiltmc/enigma/util/EntryTreePrinter.java
index de6477264..c1d21fad2 100644
--- a/enigma/src/main/java/org/quiltmc/enigma/util/EntryTreePrinter.java
+++ b/enigma/src/main/java/org/quiltmc/enigma/util/EntryTreePrinter.java
@@ -46,7 +46,7 @@ private <T> void printNode(EntryTreeNode<T> node, boolean hasNext, String indent
 		var iterator = node.getChildNodes().iterator();
 		while (iterator.hasNext()) {
 			var child = iterator.next();
-			var childIndent = indent + (hasNext ? "│\u00A0\u00A0 " : "    "); // \u00A0 is non-breaking space
+			var childIndent = indent + (hasNext ? "│   " : "    ");
 
 			this.printNode(child, iterator.hasNext(), childIndent);
 		}
diff --git a/enigma/src/main/resources/lang/en_us.json b/enigma/src/main/resources/lang/en_us.json
index dbb25bb56..49eaedc4d 100644
--- a/enigma/src/main/resources/lang/en_us.json
+++ b/enigma/src/main/resources/lang/en_us.json
@@ -343,5 +343,11 @@
 	"notification.type.info": "Info",
 	"notification.level.none": "No server notifications",
 	"notification.level.no_chat": "No chat messages",
-	"notification.level.full": "All server notifications"
+	"notification.level.full": "All server notifications",
+
+	"dev.menu.show_mapping_source_plugin": "Show mapping source plugin",
+	"dev.menu.debug_token_highlights": "Debug token highlights",
+	"dev.menu.print_mapping_tree": "Print mapping tree",
+	"dev.mapping_tree": "Mapping tree",
+	"dev.source_plugin": "Source plugin"
 }