diff --git a/src/main.js b/src/main.js
index d986fee6f6d..f925c91c3f5 100644
--- a/src/main.js
+++ b/src/main.js
@@ -16,6 +16,7 @@ const perf = require('./vs/base/common/performance');
 perf.mark('code/didStartMain');

 const path = require('path');
+const { fileURLToPath } = require('url');
 const fs = require('fs');
 const os = require('os');
 const bootstrap = require('./bootstrap');
@@ -147,6 +148,18 @@ app.once('ready', function () {
 	}
 });

+function resolveUserProduct() {
+	const userDataPath = getUserDataPath({}, product.nameShort ?? 'code-oss-dev');
+	const userProductPath = `file:///${userDataPath}/product.json`;
+
+	try {
+		// Assign the product configuration to the global scope
+		const productPath = require(fileURLToPath(userProductPath));
+		global["_VSCODE_USER_PRODUCT_JSON"] = productPath;
+	} catch (ex) {
+	}
+}
+
 /**
  * Main startup routine
  *
@@ -158,6 +171,7 @@ function startup(codeCachePath, nlsConfig) {

 	process.env['VSCODE_NLS_CONFIG'] = JSON.stringify(nlsConfig);
 	process.env['VSCODE_CODE_CACHE_PATH'] = codeCachePath || '';
+	resolveUserProduct();

 	// Load main in AMD
 	perf.mark('code/willLoadMainBundle');
diff --git a/src/vs/platform/product/common/product.ts b/src/vs/platform/product/common/product.ts
index 51a55e1..ec5ed67 100644
--- a/src/vs/platform/product/common/product.ts
+++ b/src/vs/platform/product/common/product.ts
@@ -27,6 +27,40 @@ else if (globalThis._VSCODE_PRODUCT_JSON && globalThis._VSCODE_PACKAGE_JSON) {
 	// Obtain values from product.json and package.json-data
 	product = globalThis._VSCODE_PRODUCT_JSON as unknown as IProductConfiguration;

+	const { serviceUrl, searchUrl, itemUrl, controlUrl } = product.extensionsGallery || {};
+
+	Object.assign(product, {
+		extensionsGallery: {
+			serviceUrl: env['VSCODE_GALLERY_SERVICE_URL'] || serviceUrl,
+			searchUrl: env['VSCODE_GALLERY_SEARCH_URL'] || searchUrl,
+			itemUrl: env['VSCODE_GALLERY_ITEM_URL'] || itemUrl,
+			controlUrl: env['VSCODE_GALLERY_CONTROL_URL'] || controlUrl,
+		}
+	});
+
+	// Merge user-customized product.json
+	try {
+		const merge = (...objects: any[]) =>
+			objects.reduce((result, current) => {
+				Object.keys(current).forEach((key) => {
+					if (Array.isArray(result[key]) && Array.isArray(current[key])) {
+						result[key] = current[key];
+					} else if (typeof result[key] === 'object' && typeof current[key] === 'object') {
+						result[key] = merge(result[key], current[key]);
+					} else {
+						result[key] = current[key];
+					}
+				});
+
+				return result;
+			}, {}) as any;
+
+		const userProduct = (globalThis as Record<string, any>)._VSCODE_USER_PRODUCT_JSON || {};
+
+		product = merge(product, userProduct);
+	} catch (ex) {
+	}
+
 	// Running out of sources
 	if (env['VSCODE_DEV']) {
 		Object.assign(product, {