diff --git a/data-extraction/src/getGlobal.ts b/data-extraction/src/getGlobal.ts
new file mode 100644
index 0000000..eabfe4f
--- /dev/null
+++ b/data-extraction/src/getGlobal.ts
@@ -0,0 +1,11 @@
+export function getGlobal(): any {
+	if (typeof globalThis === "object") {
+		return globalThis;
+	} else if (typeof global === "object") {
+		return global;
+	} else if (typeof window === "object") {
+		return window;
+	}
+
+	throw new Error("No global available");
+}
diff --git a/data-extraction/src/js/api/DataExtractorApi.ts b/data-extraction/src/js/api/DataExtractorApi.ts
index 8f4cfc1..7647462 100644
--- a/data-extraction/src/js/api/DataExtractorApi.ts
+++ b/data-extraction/src/js/api/DataExtractorApi.ts
@@ -2,6 +2,7 @@ import {
 	VisualizationData,
 	DataExtractionResult,
 } from "../../DataExtractionResult";
+import { LoadDataExtractorsFn } from "./LoadDataExtractorsFn";
 
 export interface DataExtractorApi {
 	/**
@@ -31,6 +32,9 @@ export interface DataExtractorApi {
 	 * @preferExisting if `true`, existing extractors with the same id are not overwritten.
 	 */
 	registerDefaultExtractors(preferExisting?: boolean): void;
+
+	registerDataExtractorsSource(id: string, fn: LoadDataExtractorsFn): void;
+	unregisterDataExtractorsSource(id: string): void;
 }
 
 export type DataResult =
@@ -70,7 +74,7 @@ export interface DataExtractorContext {
 	 */
 	evalFn: <TEval>(expression: string) => TEval;
 
-	variablesInScope: Record<string, unknown>;
+	variablesInScope: Record<string, () => unknown>;
 }
 
 export interface DataExtraction {
diff --git a/data-extraction/src/js/api/DataExtractorApiImpl.ts b/data-extraction/src/js/api/DataExtractorApiImpl.ts
index ef4c864..efc321d 100644
--- a/data-extraction/src/js/api/DataExtractorApiImpl.ts
+++ b/data-extraction/src/js/api/DataExtractorApiImpl.ts
@@ -5,20 +5,21 @@ import {
 	DataExtractor,
 	DataExtraction,
 	ExtractionCollector,
+	DataExtractorContext,
 } from "./DataExtractorApi";
 import { DataExtractorInfo } from "../../DataExtractionResult";
 import { registerDefaultExtractors } from "./default-extractors";
+import { LoadDataExtractorsFn } from "./LoadDataExtractorsFn";
+import * as helpers from "../helpers";
 
 /**
  * @internal
  */
 export class DataExtractorApiImpl implements DataExtractorApi {
-	public static lastEvalFn: (<T>(expression: string) => T) | undefined;
-	public static lastVariablesInScope:
-		| Record<string, unknown>
-		| undefined = undefined;
+	public static lastContext: DataExtractorContext | undefined = undefined;
 
 	private readonly extractors = new Map<string, DataExtractor>();
+	private readonly extractorSources = new Map<string, LoadDataExtractorsFn>();
 
 	private toJson<TData>(data: TData): JSONString<TData> {
 		return JSON.stringify(data) as any;
@@ -38,7 +39,7 @@ export class DataExtractorApiImpl implements DataExtractorApi {
 		valueFn: () => unknown,
 		evalFn: <T>(expression: string) => T,
 		preferredDataExtractorId: string | undefined,
-		variablesInScope: Record<string, unknown>
+		variablesInScope: Record<string, () => unknown>
 	): JSONString<DataResult> {
 		const extractions = new Array<DataExtraction>();
 		const extractionCollector: ExtractionCollector = {
@@ -47,19 +48,27 @@ export class DataExtractorApiImpl implements DataExtractorApi {
 			},
 		};
 
-		DataExtractorApiImpl.lastVariablesInScope = variablesInScope;
-		DataExtractorApiImpl.lastEvalFn = evalFn;
+		const context: DataExtractorContext = {
+			evalFn,
+			variablesInScope,
+		};
+
+		DataExtractorApiImpl.lastContext = context;
 		const value = valueFn();
 
-		for (const e of this.extractors.values()) {
-			e.getExtractions(value, extractionCollector, {
-				evalFn,
-				variablesInScope,
-			});
+		const extractors = new Array<DataExtractor>();
+
+		for (const fn of this.extractorSources.values()) {
+			fn((extractor) => {
+				extractors.push(extractor);
+			}, helpers);
 		}
 
-		DataExtractorApiImpl.lastVariablesInScope = undefined;
-		DataExtractorApiImpl.lastEvalFn = undefined;
+		for (const e of [...this.extractors.values(), ...extractors]) {
+			e.getExtractions(value, extractionCollector, context);
+		}
+
+		DataExtractorApiImpl.lastContext = undefined;
 
 		extractions.sort((a, b) => b.priority - a.priority);
 		let usedExtraction = extractions[0];
@@ -69,7 +78,7 @@ export class DataExtractorApiImpl implements DataExtractorApi {
 
 		if (preferredDataExtractorId) {
 			const preferred = extractions.find(
-				e => e.id === preferredDataExtractorId
+				(e) => e.id === preferredDataExtractorId
 			);
 			if (preferred) {
 				usedExtraction = preferred;
@@ -99,4 +108,15 @@ export class DataExtractorApiImpl implements DataExtractorApi {
 		// TODO consider preferExisting
 		registerDefaultExtractors(this);
 	}
+
+	public registerDataExtractorsSource(
+		id: string,
+		fn: LoadDataExtractorsFn
+	): void {
+		this.extractorSources.set(id, fn);
+	}
+
+	public unregisterDataExtractorsSource(id: string): void {
+		this.extractorSources.delete(id);
+	}
 }
diff --git a/data-extraction/src/js/api/default-extractors/InjectedExtractor.ts b/data-extraction/src/js/api/default-extractors/InjectedExtractor.ts
deleted file mode 100644
index 68f1d98..0000000
--- a/data-extraction/src/js/api/default-extractors/InjectedExtractor.ts
+++ /dev/null
@@ -1,34 +0,0 @@
-import {
-	DataExtractor,
-	ExtractionCollector,
-	DataExtractorContext,
-	LoadDataExtractorsFn,
-} from "..";
-import * as helpers from "../../helpers";
-
-export class InjectedExtractor implements DataExtractor {
-	readonly id = "injected-extractor";
-
-	getExtractions(
-		data: unknown,
-		extractionCollector: ExtractionCollector,
-		context: DataExtractorContext
-	): void {
-		const key = "@hediet/debug-visualizer/injectedScripts";
-		const injectedExtractorsFns = Object.values(
-			(global as any)[key]
-		) as LoadDataExtractorsFn[];
-
-		const extractors = new Array<DataExtractor>();
-
-		for (const fn of injectedExtractorsFns) {
-			fn(extractor => {
-				extractors.push(extractor);
-			}, helpers);
-		}
-
-		for (const extractor of extractors) {
-			extractor.getExtractions(data, extractionCollector, context);
-		}
-	}
-}
diff --git a/data-extraction/src/js/api/default-extractors/registerDefaultDataExtractors.ts b/data-extraction/src/js/api/default-extractors/registerDefaultDataExtractors.ts
index 86a7ab9..f31b151 100644
--- a/data-extraction/src/js/api/default-extractors/registerDefaultDataExtractors.ts
+++ b/data-extraction/src/js/api/default-extractors/registerDefaultDataExtractors.ts
@@ -9,7 +9,6 @@ import { getDataExtractorApi } from "../injection";
 import { GridExtractor } from "./GridExtractor";
 import { TableDataExtractor } from "./TableExtractor";
 import { StringDiffExtractor } from "./StringDiffExtractor";
-import { InjectedExtractor } from "./InjectedExtractor";
 
 /**
  * The default data extractors should be registered by VS Code automatically.
@@ -28,7 +27,6 @@ export function registerDefaultExtractors(
 		new GridExtractor(),
 		new TableDataExtractor(),
 		new StringDiffExtractor(),
-		new InjectedExtractor(),
 	]) {
 		api.registerExtractor(item);
 	}
diff --git a/data-extraction/src/js/api/injection.ts b/data-extraction/src/js/api/injection.ts
index b8cb175..b37d8d1 100644
--- a/data-extraction/src/js/api/injection.ts
+++ b/data-extraction/src/js/api/injection.ts
@@ -3,6 +3,7 @@ import { DataExtractorApi } from "./DataExtractorApi";
 import { DataExtractorApiImpl } from "./DataExtractorApiImpl";
 import * as helpers from "../helpers";
 import * as globalHelpers from "../global-helpers";
+import { getGlobal } from "../../getGlobal";
 
 /**
  * Returns standalone JS code representing an expression that initializes the data extraction API.
@@ -28,16 +29,11 @@ export function getExpressionForDataExtractorApi(): string {
 	return `((${selfContainedGetInitializedDataExtractorApi.toString()})())`;
 }
 
-export function getExpressionToDetectDataExtractorApiPresence(): string {
-	return `((${selfContainedIsDataExtractorApiInitialized.toString()})())`;
-}
-
-const apiKey = "@hediet/data-extractor-api/v2";
+const apiKey = "@hediet/data-extractor-api/v3";
 
 export function getDataExtractorApi(): DataExtractorApi {
 	installHelpers();
-	const globalObj =
-		typeof window === "object" ? (window as any) : (global as any);
+	const globalObj = getGlobal();
 	if (!globalObj[apiKey]) {
 		globalObj[apiKey] = new DataExtractorApiImpl();
 	}
@@ -45,33 +41,31 @@ export function getDataExtractorApi(): DataExtractorApi {
 }
 
 /**
+ * This code is used to detect if the API has not been initialized yet.
  * @internal
  */
-function selfContainedIsDataExtractorApiInitialized(): boolean {
-	const globalObj =
-		typeof window === "object" ? (window as any) : (global as any);
-	const key: typeof apiKey = "@hediet/data-extractor-api/v2";
-	let api: DataExtractorApi | undefined = globalObj[key];
-	return api !== undefined;
-}
+ export const ApiHasNotBeenInitializedCode = "EgH0cybXij1jYUozyakO" as const;
 
-/**
- * @internal
- */
-function selfContainedGetInitializedDataExtractorApi(): DataExtractorApi {
-	const globalObj =
-		typeof window === "object" ? (window as any) : (global as any);
-	const key: typeof apiKey = "@hediet/data-extractor-api/v2";
-	let api: DataExtractorApi | undefined = globalObj[key];
-	if (!api) {
-		throw new Error(`Data Extractor API has not been initialized.`);
-	}
-	return api;
-}
+ /**
+  * @internal
+  */
+ function selfContainedGetInitializedDataExtractorApi(): DataExtractorApi {
+	 const globalObj =
+		 typeof window === "object" ? (window as any) : (global as any);
+	 const key: typeof apiKey = "@hediet/data-extractor-api/v3";
+	 let api: DataExtractorApi | undefined = globalObj[key];
+	 if (!api) {
+		 const code: typeof ApiHasNotBeenInitializedCode =
+			 "EgH0cybXij1jYUozyakO";
+		 throw new Error(
+			 `Data Extractor API has not been initialized. Code: ${code}`
+		 );
+	 }
+	 return api;
+ }
 
 export function installHelpers(): void {
-	const globalObj =
-		typeof window === "object" ? (window as any) : (global as any);
+	const globalObj = getGlobal();
 	// `hediet` as prefix to avoid name collision (I own `hediet.de`).
 	globalObj["hedietDbgVis"] = { ...helpers, ...globalHelpers };
 }
diff --git a/data-extraction/src/js/helpers/cache.ts b/data-extraction/src/js/helpers/cache.ts
index d804554..7f4d3e0 100644
--- a/data-extraction/src/js/helpers/cache.ts
+++ b/data-extraction/src/js/helpers/cache.ts
@@ -12,8 +12,8 @@ export function cache<T>(
 	let resultFn: () => any;
 	let key: string;
 	if (typeof expression === "string") {
-		const evalFn = DataExtractorApiImpl.lastEvalFn!;
-		resultFn = () => evalFn(expression);
+		const context = DataExtractorApiImpl.lastContext!;
+		resultFn = () => context.evalFn(expression);
 		key = JSON.stringify({ expr: expression, id });
 	} else {
 		resultFn = () => expression();
diff --git a/data-extraction/src/js/helpers/find.ts b/data-extraction/src/js/helpers/find.ts
index bbb1035..6ef44d9 100644
--- a/data-extraction/src/js/helpers/find.ts
+++ b/data-extraction/src/js/helpers/find.ts
@@ -2,12 +2,22 @@ import { DataExtractorApiImpl } from "../api";
 
 export function find(predicate: (obj: unknown) => boolean): unknown {
 	const processed = new Set();
-	if (!DataExtractorApiImpl.lastVariablesInScope) {
-		throw new Error("No variables in scope!");
+	if (!DataExtractorApiImpl.lastContext) {
+		throw new Error("No data extractor context!");
 	}
 
-	const values = Object.values(DataExtractorApiImpl.lastVariablesInScope);
-	const queue = [...values];
+	const values = Object.values(
+		DataExtractorApiImpl.lastContext.variablesInScope
+	);
+	const queue = [
+		...values.map((v) => {
+			try {
+				return v();
+			} catch (e) {
+				return undefined;
+			}
+		}),
+	];
 
 	let i = 10000;
 	while (i > 0) {
diff --git a/data-extraction/src/js/helpers/tryEval.ts b/data-extraction/src/js/helpers/tryEval.ts
index bab659c..eea5149 100644
--- a/data-extraction/src/js/helpers/tryEval.ts
+++ b/data-extraction/src/js/helpers/tryEval.ts
@@ -30,17 +30,17 @@ export function tryEval(
 	obj: Record<string, string> | string[] | string
 ): Record<string, unknown> | unknown {
 	const result: Record<string, unknown> = {};
-	const evalFn = DataExtractorApiImpl.lastEvalFn!;
+	const context = DataExtractorApiImpl.lastContext!;
 	if (Array.isArray(obj)) {
 		for (const val of obj) {
 			try {
-				result[val] = evalFn(val);
+				result[val] = context.evalFn(val);
 			} catch (e) {}
 		}
 	} else {
 		for (const [key, val] of Object.entries(obj)) {
 			try {
-				result[key] = evalFn(val);
+				result[key] = context.evalFn(val);
 			} catch (e) {}
 		}
 	}
diff --git a/docs/custom-scripts.gif b/docs/custom-scripts.gif
new file mode 100644
index 0000000..433537f
Binary files /dev/null and b/docs/custom-scripts.gif differ
diff --git a/extension/package.json b/extension/package.json
index c65ada2..77e61c8 100644
--- a/extension/package.json
+++ b/extension/package.json
@@ -4,7 +4,7 @@
 	"displayName": "Debug Visualizer",
 	"description": "A visual watch window that lets you visualize your data structures while debugging.",
 	"icon": "docs/logo.drawio.png",
-	"version": "2.2.1",
+	"version": "2.2.3",
 	"license": "GPL-3.0",
 	"engines": {
 		"vscode": "^1.46.0"
diff --git a/extension/src/VisualizationBackend/JsVisualizationSupport.ts b/extension/src/VisualizationBackend/JsVisualizationSupport.ts
index 58b6823..ae6836d 100644
--- a/extension/src/VisualizationBackend/JsVisualizationSupport.ts
+++ b/extension/src/VisualizationBackend/JsVisualizationSupport.ts
@@ -1,31 +1,25 @@
 import {
-	getExpressionForDataExtractorApi,
-	DataResult,
-	getExpressionToInitializeDataExtractorApi,
 	DataExtractionResult,
-	getExpressionToDetectDataExtractorApiPresence,
+	DataResult,
+	 getExpressionForDataExtractorApi,
+	getExpressionToInitializeDataExtractorApi,
+	ApiHasNotBeenInitializedCode,
 } from "@hediet/debug-visualizer-data-extraction";
-import { DebugSessionProxy } from "../proxies/DebugSessionProxy";
-import {
-	DebugSessionVisualizationSupport,
-	VisualizationBackend,
-	GetVisualizationDataArgs,
-	VisualizationBackendBase,
-} from "./VisualizationBackend";
-import { FormattedMessage } from "../webviewContract";
-import { registerUpdateReconciler, hotClass } from "@hediet/node-reload";
+import { hotClass, registerUpdateReconciler } from "@hediet/node-reload";
+import { existsSync, readFileSync, watch } from "fs";
+import { observable, reaction } from "mobx";
+import { window, workspace } from "vscode";
 import { Config } from "../Config";
 import { DebuggerViewProxy } from "../proxies/DebuggerViewProxy";
-import { readFileSync, existsSync } from "fs";
-import { reaction, observable } from "mobx";
+import { DebugSessionProxy } from "../proxies/DebugSessionProxy";
+import { FormattedMessage } from "../webviewContract";
 import {
-	workspace,
-	FileSystemWatcher,
-	CancellationTokenSource,
-	CancellationToken,
-	window,
-} from "vscode";
-import { ResettableTimeout } from "@hediet/std/timer";
+	DebugSessionVisualizationSupport,
+	GetVisualizationDataArgs,
+	VisualizationBackend,
+	VisualizationBackendBase,
+} from "./VisualizationBackend";
+import { Disposable } from "@hediet/std/disposable";
 
 registerUpdateReconciler(module);
 
@@ -64,8 +58,7 @@ export class JsEvaluationEngine implements DebugSessionVisualizationSupport {
 
 class JsVisualizationBackend extends VisualizationBackendBase {
 	public readonly expressionLanguageId = "javascript";
-	private apiInitialized = false;
-	private initializedPromise: Promise<void> | undefined = undefined;
+	private initializePromise: Promise<void> | undefined = undefined;
 
 	constructor(
 		debugSession: DebugSessionProxy,
@@ -82,16 +75,41 @@ class JsVisualizationBackend extends VisualizationBackendBase {
 		return "repl";
 	}
 
-	public async getVisualizationData({
+	public async getVisualizationData(
+		args: GetVisualizationDataArgs
+	): Promise<
+		| { kind: "data"; result: DataExtractionResult }
+		| { kind: "error"; message: FormattedMessage }
+	> {
+		const result = await this._getVisualizationData(args);
+
+		if (result.kind === "not-initialized") {
+			await this.initializeApiSafe();
+
+			const result2 = await this._getVisualizationData(args);
+
+			if (result2.kind !== "not-initialized") {
+				return result2;
+			} else {
+				return {
+					kind: "error",
+					message: "Could not initialize API",
+				};
+			}
+		}
+
+		return result;
+	}
+
+	private async _getVisualizationData({
 		expression,
 		preferredExtractorId,
 	}: GetVisualizationDataArgs): Promise<
 		| { kind: "data"; result: DataExtractionResult }
 		| { kind: "error"; message: FormattedMessage }
+		| { kind: "not-initialized" }
 	> {
 		try {
-			await this.ensureRuntimeIsInjected();
-
 			const frameId = this.debuggerView.getActiveStackFrameId(
 				this.debugSession
 			);
@@ -101,8 +119,8 @@ class JsVisualizationBackend extends VisualizationBackendBase {
 				const scopes = await this.debugSession.getScopes({ frameId });
 				const scopeVariables = await Promise.all(
 					scopes
-						.filter(s => !s.expensive)
-						.map(s =>
+						.filter((s) => !s.expensive && s.name !== "Global")
+						.map((s) =>
 							this.debugSession.getVariables({
 								variablesReference: s.variablesReference,
 							})
@@ -111,13 +129,13 @@ class JsVisualizationBackend extends VisualizationBackendBase {
 				for (const variables of scopeVariables) {
 					variableNames.push(
 						...variables
-							.filter(v => v.value !== "undefined")
-							.map(v => v.name)
+							.filter((v) => v.value !== "undefined")
+							.map((v) => v.name)
 					);
 				}
 
-				if (variableNames.length > 100) {
-					variableNames.length = 100;
+				if (variableNames.length > 50) {
+					variableNames.length = 50;
 				}
 			}
 
@@ -129,7 +147,7 @@ class JsVisualizationBackend extends VisualizationBackendBase {
                     e => (${expression}),
                     expr => eval(expr),
                     ${preferredExtractorExpr},
-					{${variableNames.map(n => `${n}: ${n}`).join(",")}},
+					{${variableNames.map((n) => `${n}: () => ${n}`).join(",")}},
                 )`;
 
 			const wrappedExpr = `
@@ -171,6 +189,15 @@ class JsVisualizationBackend extends VisualizationBackendBase {
 				throw new Error("Invalid Data");
 			}
 		} catch (error) {
+			if (
+				typeof error.message === "string" &&
+				error.message.indexOf(ApiHasNotBeenInitializedCode) !== -1
+			) {
+				return {
+					kind: "not-initialized",
+				};
+			}
+
 			return {
 				kind: "error",
 				message: error.message,
@@ -178,144 +205,148 @@ class JsVisualizationBackend extends VisualizationBackendBase {
 		}
 	}
 
-	private ensureRuntimeIsInjected(): Promise<void> | undefined {
-		if (this.apiInitialized) {
-			return;
-		}
-
-		if (this.initializedPromise) {
-			return this.initializedPromise;
-		} else {
-			this.initializedPromise = this._ensureRuntimeIsInjected();
+	private initializeApiSafe(): Promise<void> {
+		if (!this.initializePromise) {
+			this.initializePromise = this.initializeApi().finally(
+				() => (this.initializePromise = undefined)
+			);
 		}
+		return this.initializePromise;
 	}
 
-	private async _ensureRuntimeIsInjected(): Promise<void> {
-		const body = getExpressionToDetectDataExtractorApiPresence();
+	private async initializeApi(): Promise<void> {
+		// prefer existing is true, so that manually registered (possibly newer) extractors are not overwritten.
+		const expression = `${getExpressionToInitializeDataExtractorApi()}.registerDefaultExtractors(true);`;
 
-		const reply = await this.debugSession.evaluate({
-			expression: body,
+		await this.debugSession.evaluate({
+			expression,
 			frameId: undefined,
 			context: this.getContext(),
 		});
-		const isApiInitialized = reply.result === "true";
-
-		if (!isApiInitialized) {
-			await this.initializeApi();
-		}
 
 		await this.initializeCustomScripts();
 	}
 
-	private async initializeApi(): Promise<boolean> {
-		try {
-			// prefer existing is true, so that manually registered (possibly newer) extractors are not overwritten.
-			const expression = `${getExpressionToInitializeDataExtractorApi()}.registerDefaultExtractors(true);`;
+	private customScripts: undefined | CustomScripts;
 
-			await this.debugSession.evaluate({
-				expression,
-				frameId: undefined,
-				context: this.getContext(),
-			});
-
-			return true;
-		} catch (error) {
-			return false;
-		}
+	private async initializeCustomScripts(): Promise<void> {
+		this.dispose.untrack(this.customScripts);
+		this.customScripts?.dispose();
+		this.customScripts = this.dispose.track(new CustomScripts(this.debugSession, this.config, () => this.onChangeEmitter.emit()));
 	}
+}
+
+class CustomScripts {
+	public readonly dispose = Disposable.fn();
 
 	@observable
 	private filesVersionId: number = 0;
 
 	private readonly fileChangeDebouncedScheduler = new DebouncedScheduler(100);
 
-	private async initializeCustomScripts(): Promise<void> {
-		await this.debugSession.evaluate({
-			expression: `global["${injectedScriptsKey}"] = {};`,
-			frameId: undefined,
-			context: "repl",
-		});
+	constructor(private readonly debugSession: DebugSessionProxy, private readonly config: Config, private readonly changeHandler: () => void) {
+		this.init();
+	}
 
+	private init(): void {
 		const watchers = new Map<string, WatchedFile>();
 		this.dispose.track({
 			dispose: () => {
 				for (const w of watchers.values()) {
-					w.watcher.dispose();
+					w.dispose();
 				}
 			},
 		});
 
-		reaction(
-			() => ({
-				customScriptPaths: [...this.config.customScriptPaths],
-				version: this.filesVersionId,
-			}),
-			async ({ customScriptPaths }) => {
-				const promises = new Array<Promise<[Result, WatchedFile]>>();
+		this.dispose.track({
+			dispose: reaction(
+				() => ({
+					customScriptPaths: [...this.config.customScriptPaths],
+					version: this.filesVersionId,
+				}),
+				async ({ customScriptPaths }) => {
+					const promises = new Array<
+						Promise<[Result, WatchedFile]>
+					>();
 
-				const activePaths = new Set<string>();
-				for (const fsPath of customScriptPaths) {
-					activePaths.add(fsPath);
-					let entry = watchers.get(fsPath);
-					if (!entry) {
-						entry = new WatchedFile(fsPath, this.debugSession);
-						watchers.set(fsPath, entry);
-						entry.watcher.onDidChange(() => {
-							this.fileChangeDebouncedScheduler.run(() => {
-								this.filesVersionId++;
-							});
-						});
+					const activePaths = new Set<string>();
+					for (const fsPath of customScriptPaths) {
+						activePaths.add(fsPath);
+						let entry = watchers.get(fsPath);
+						if (!entry) {
+							entry = new WatchedFile(
+								fsPath,
+								this.debugSession,
+								() => {
+									this.fileChangeDebouncedScheduler.run(
+										() => {
+											this.filesVersionId++;
+										}
+									);
+								}
+							);
+							watchers.set(fsPath, entry);
+						}
+
+						promises.push(entry.update().then((e) => [e, entry!]));
 					}
 
-					promises.push(entry.update().then(e => [e, entry!]));
-				}
-
-				for (const [fsPath, entry] of watchers) {
-					if (!activePaths.has(fsPath)) {
-						promises.push(entry.remove().then(e => [e, entry]));
-						entry.watcher.dispose();
-						watchers.delete(fsPath);
+					for (const [fsPath, entry] of watchers) {
+						if (!activePaths.has(fsPath)) {
+							promises.push(
+								entry.remove().then((e) => [e, entry])
+							);
+							entry.dispose();
+							watchers.delete(fsPath);
+						}
 					}
-				}
 
-				const results = await Promise.all(promises);
-				const errors = results.filter(([r]) => r.error);
-				for (const [e, watcher] of errors) {
-					window.showErrorMessage(
-						`Error while evaluating "${watcher.fsPath}": ${
-							e.error!.message
-						}`
-					);
-				}
+					const results = await Promise.all(promises);
+					const errors = results.filter(([r]) => r.error);
+					for (const [e, watcher] of errors) {
+						window.showErrorMessage(
+							`Error while evaluating "${watcher.fsPath}": ${
+								e.error!.message
+							}`
+						);
+					}
 
-				if (promises.length > 0) {
-					this.onChangeEmitter.emit();
+					if (promises.length > 0) {
+						this.changeHandler();
+					}
+				},
+				{
+					fireImmediately: true,
 				}
-			},
-			{
-				fireImmediately: true,
-			}
-		);
+			),
+		});
 	}
 }
 
-const injectedScriptsKey = `@hediet/debug-visualizer/injectedScripts`;
-
 interface Result {
 	error?: { message: string };
 }
 
 class WatchedFile {
 	public static nextId = 0;
-	public readonly watcher = workspace.createFileSystemWatcher(this.fsPath);
+	private readonly watcher = watch(
+		this.fsPath,
+		{ encoding: "utf-8" },
+		this.changeHandler
+	);
 	public readonly id = WatchedFile.nextId++;
 	public lastContent: string | undefined = undefined;
 
 	constructor(
 		public readonly fsPath: string,
-		private readonly debugSession: DebugSessionProxy
+		private readonly debugSession: DebugSessionProxy,
+		private readonly changeHandler: () => void
 	) {}
 
+	public dispose(): void {
+		this.watcher.close();
+	}
+
 	public async update(): Promise<Result> {
 		if (!existsSync(this.fsPath)) {
 			return {
@@ -337,7 +368,9 @@ class WatchedFile {
 				load => {
 					var module = {};
 					load(module);
-					global["${injectedScriptsKey}"]["${this.id}"] = module.exports;
+					${getExpressionForDataExtractorApi()}.registerDataExtractorsSource("${
+			this.id
+		}", module.exports);
 				}
 			)
 			(
@@ -357,7 +390,9 @@ class WatchedFile {
 	}
 
 	public async remove(): Promise<Result> {
-		const expression = `(() => { delete global["${injectedScriptsKey}"]["${this.id}"]; })()`;
+		const expression = `${getExpressionForDataExtractorApi()}.unregisterDataExtractorsSource("${
+			this.id
+		}")`;
 		try {
 			await this.debugSession.evaluate({
 				expression,
diff --git a/webview/package.json b/webview/package.json
index b4b3903..438d8c2 100644
--- a/webview/package.json
+++ b/webview/package.json
@@ -14,13 +14,13 @@
 		"classnames": "^2.2.6",
 		"mobx": "^5.15.4",
 		"mobx-react": "^6.1.8",
-		"monaco-editor": "^0.20.0",
+		"monaco-editor": "^0.25.2",
 		"popper.js": "^1.16.1",
 		"react": "^16.12.0",
 		"react-dom": "^16.12.0",
 		"react-measure": "^2.3.0",
 		"@hediet/debug-visualizer-data-extraction": "*",
-		"@hediet/visualization-bundle": "^0.2.1",
+		"@hediet/visualization-bundle": "^0.2.3",
 		"@hediet/visualization-core": "^0.2.0",
 		"@knuddels/mobx-logger": "^1.1.1",
 		"less-loader": "^6.2.0"
@@ -37,7 +37,7 @@
 		"file-loader": "^5.1.0",
 		"fork-ts-checker-webpack-plugin": "^4.0.4",
 		"html-webpack-plugin": "^3.2.0",
-		"monaco-editor-webpack-plugin": "^1.9.0",
+		"monaco-editor-webpack-plugin": "^4.0.0",
 		"sass": "^1.25.0",
 		"raw-loader": "^4.0.0",
 		"sass-loader": "^8.0.2",
diff --git a/webview/src/index.tsx b/webview/src/index.tsx
index f7a90c5..322011a 100644
--- a/webview/src/index.tsx
+++ b/webview/src/index.tsx
@@ -2,6 +2,9 @@ import * as React from "react";
 import * as ReactDOM from "react-dom";
 import "./style.scss";
 import { App } from "./components/App";
+import * as monaco from "monaco-editor";
+
+(globalThis as any).monaco = monaco;
 
 const elem = document.createElement("div");
 elem.className = "react-root";
diff --git a/yarn.lock b/yarn.lock
index 622c2b6..71c631e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -487,10 +487,10 @@
     stacktracey "^1.2.112"
     ws "^7.0.0"
 
-"@hediet/monaco-editor-react@^0.1.1":
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/@hediet/monaco-editor-react/-/monaco-editor-react-0.1.1.tgz#041f805aeb188403c7876f0f364d2a429e706031"
-  integrity sha512-0DZZfLcFNuc3Wrn+2eztnRloCBe6GV8zIrGT3LPdZlWYEigJT+Qh7ANvRHF0tCS5YPAFGQNZJcfzKbBfqRGo4w==
+"@hediet/monaco-editor-react@^0.2.0":
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/@hediet/monaco-editor-react/-/monaco-editor-react-0.2.0.tgz#4a98102baf1942f210fc19fd406b6c82da3bf583"
+  integrity sha512-EA71+iv9sV25+YgBQDJ4Ou17sOJCXQat7r5AOD5STZHcUQdSuQufI2t9ue+wJIm4048P9sQ/ruW3pYmwxF9Amw==
 
 "@hediet/node-reload@^0.7.3":
   version "0.7.3"
@@ -550,22 +550,22 @@
     "@hediet/std" "^0.6.0"
     io-ts "^1.8.6"
 
-"@hediet/visualization-bundle@^0.2.1":
-  version "0.2.1"
-  resolved "https://registry.yarnpkg.com/@hediet/visualization-bundle/-/visualization-bundle-0.2.1.tgz#397a6bff0ea12018a7a1cb1c182ef8c5de87328f"
-  integrity sha512-Qfyn8WbWGwuE5J1z8U7l8E5VKuG3DpS2JJOtKhlW1QW/rhqBWOLd5avifxqjWxiMIfqh3NTShp9gLHpmI2Bysw==
+"@hediet/visualization-bundle@^0.2.3":
+  version "0.2.3"
+  resolved "https://registry.yarnpkg.com/@hediet/visualization-bundle/-/visualization-bundle-0.2.3.tgz#8323706dcaaafc973fdc57da68e6527265e5bfcc"
+  integrity sha512-RpzAST/K5O9FaEaCshHEY7VeGRVlwoTLLcWPkgxzeuZlRr5CNTw8d7Lznh+RaLD1rbz/UEezq2pI3qFYnq/z4w==
   dependencies:
     "@finos/perspective-viewer" "^0.5.2"
     "@finos/perspective-viewer-d3fc" "^0.5.2"
     "@finos/perspective-viewer-datagrid" "^0.5.2"
-    "@hediet/monaco-editor-react" "^0.1.1"
+    "@hediet/monaco-editor-react" "^0.2.0"
     "@hediet/semantic-json" "^0.3.15"
     "@hediet/std" "^0.6.0"
     classnames "^2.2.6"
     line-column "^1.0.2"
     mobx "^5.15.4"
     mobx-react "^6.1.8"
-    monaco-editor "^0.20.0"
+    monaco-editor "^0.25.2"
     plotly.js "^1.54.7"
     react "^16.12.0"
     react-dom "^16.12.0"
@@ -6861,17 +6861,17 @@ moment@^2.19.1:
   resolved "https://registry.yarnpkg.com/moment/-/moment-2.27.0.tgz#8bff4e3e26a236220dfe3e36de756b6ebaa0105d"
   integrity sha512-al0MUK7cpIcglMv3YF13qSgdAIqxHTO7brRtaz3DlSULbqfazqkc5kEjNrLDOM7fsjshoFIihnU8snrP7zUvhQ==
 
-monaco-editor-webpack-plugin@^1.9.0:
-  version "1.9.0"
-  resolved "https://registry.yarnpkg.com/monaco-editor-webpack-plugin/-/monaco-editor-webpack-plugin-1.9.0.tgz#5b547281b9f404057dc5d8c5722390df9ac90be6"
-  integrity sha512-tOiiToc94E1sb50BgZ8q8WK/bxus77SRrwCqIpAB5er3cpX78SULbEBY4YPOB8kDolOzKRt30WIHG/D6gz69Ww==
+monaco-editor-webpack-plugin@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/monaco-editor-webpack-plugin/-/monaco-editor-webpack-plugin-4.0.0.tgz#95be3f48f4220999b909266a9997727f0deab947"
+  integrity sha512-4BT9XDRQXraMQjxEUjR+uuubRe3RIPkvVoGw8zwWG++s7wq6TAiXaSOMdkdS9TrjCREgSnygCOlVzY6MS8RPuA==
   dependencies:
-    loader-utils "^1.2.3"
+    loader-utils "^2.0.0"
 
-monaco-editor@^0.20.0:
-  version "0.20.0"
-  resolved "https://registry.yarnpkg.com/monaco-editor/-/monaco-editor-0.20.0.tgz#5d5009343a550124426cb4d965a4d27a348b4dea"
-  integrity sha512-hkvf4EtPJRMQlPC3UbMoRs0vTAFAYdzFQ+gpMb8A+9znae1c43q8Mab9iVsgTcg/4PNiLGGn3SlDIa8uvK1FIQ==
+monaco-editor@^0.25.2:
+  version "0.25.2"
+  resolved "https://registry.yarnpkg.com/monaco-editor/-/monaco-editor-0.25.2.tgz#119e2b15bbd968a1a99c03cac9c329316d7c37e9"
+  integrity sha512-5iylzSJevCnzJn9UVsW8yOZ3yHjmAs4TfvH3zsbftKiFKmHG0xirGN6DK9Kk04VSWxYCZZAIafYJoNJJMAU1KA==
 
 monotone-convex-hull-2d@^1.0.1:
   version "1.0.1"
@@ -8063,10 +8063,10 @@ prelude-ls@~1.1.2:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
   integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
 
-prettier@^1.19.1:
-  version "1.19.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
-  integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
+prettier@^2.3.1:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.3.1.tgz#76903c3f8c4449bc9ac597acefa24dc5ad4cbea6"
+  integrity sha512-p+vNbgpLjif/+D+DwAZAbndtRrR0md0MwfmOVN9N+2RgyACMT+7tfaRnT+WDPkqnuVwleyuBIG2XBxKDme3hPA==
 
 pretty-error@^2.0.2:
   version "2.1.1"