diff --git a/packages/cli/src/ui/commands/extensionsCommand.test.ts b/packages/cli/src/ui/commands/extensionsCommand.test.ts
index 562744a0deb..c10b3896d1e 100644
--- a/packages/cli/src/ui/commands/extensionsCommand.test.ts
+++ b/packages/cli/src/ui/commands/extensionsCommand.test.ts
@@ -9,9 +9,14 @@ import { createMockCommandContext } from '../../test-utils/mockCommandContext.js
 import { MessageType } from '../types.js';
 import { extensionsCommand } from './extensionsCommand.js';
 import { type CommandContext } from './types.js';
-import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 import { type ExtensionUpdateAction } from '../state/extensions.js';
 
+import open from 'open';
+vi.mock('open', () => ({
+  default: vi.fn(),
+}));
+
 vi.mock('../../config/extensions/update.js', () => ({
   updateExtension: vi.fn(),
   checkForAllExtensionUpdates: vi.fn(),
@@ -26,6 +31,7 @@ describe('extensionsCommand', () => {
   beforeEach(() => {
     vi.resetAllMocks();
     mockGetExtensions.mockReturnValue([]);
+    vi.mocked(open).mockClear();
     mockContext = createMockCommandContext({
       services: {
         config: {
@@ -39,6 +45,11 @@ describe('extensionsCommand', () => {
     });
   });
 
+  afterEach(() => {
+    // Restore any stubbed environment variables, similar to docsCommand.test.ts
+    vi.unstubAllEnvs();
+  });
+
   describe('list', () => {
     it('should add an EXTENSIONS_LIST item to the UI', async () => {
       if (!extensionsCommand.action) throw new Error('Action not defined');
@@ -302,4 +313,89 @@ describe('extensionsCommand', () => {
       });
     });
   });
+
+  describe('explore', () => {
+    const exploreAction = extensionsCommand.subCommands?.find(
+      (cmd) => cmd.name === 'explore',
+    )?.action;
+
+    if (!exploreAction) {
+      throw new Error('Explore action not found');
+    }
+
+    it("should add an info message and call 'open' in a non-sandbox environment", async () => {
+      // Ensure no special environment variables that would affect behavior
+      vi.stubEnv('NODE_ENV', '');
+      vi.stubEnv('SANDBOX', '');
+
+      await exploreAction(mockContext, '');
+
+      const extensionsUrl = 'https://geminicli.com/extensions/';
+      expect(mockContext.ui.addItem).toHaveBeenCalledWith(
+        {
+          type: MessageType.INFO,
+          text: `Opening extensions page in your browser: ${extensionsUrl}`,
+        },
+        expect.any(Number),
+      );
+
+      expect(open).toHaveBeenCalledWith(extensionsUrl);
+    });
+
+    it('should only add an info message in a sandbox environment', async () => {
+      // Simulate a sandbox environment
+      vi.stubEnv('NODE_ENV', '');
+      vi.stubEnv('SANDBOX', 'gemini-sandbox');
+      const extensionsUrl = 'https://geminicli.com/extensions/';
+
+      await exploreAction(mockContext, '');
+
+      expect(mockContext.ui.addItem).toHaveBeenCalledWith(
+        {
+          type: MessageType.INFO,
+          text: `View available extensions at ${extensionsUrl}`,
+        },
+        expect.any(Number),
+      );
+
+      // Ensure 'open' was not called in the sandbox
+      expect(open).not.toHaveBeenCalled();
+    });
+
+    it('should add an info message and not call open in NODE_ENV test environment', async () => {
+      vi.stubEnv('NODE_ENV', 'test');
+      vi.stubEnv('SANDBOX', '');
+      const extensionsUrl = 'https://geminicli.com/extensions/';
+
+      await exploreAction(mockContext, '');
+
+      expect(mockContext.ui.addItem).toHaveBeenCalledWith(
+        {
+          type: MessageType.INFO,
+          text: `Would open extensions page in your browser: ${extensionsUrl} (skipped in test environment)`,
+        },
+        expect.any(Number),
+      );
+
+      // Ensure 'open' was not called in test environment
+      expect(open).not.toHaveBeenCalled();
+    });
+
+    it('should handle errors when opening the browser', async () => {
+      vi.stubEnv('NODE_ENV', '');
+      const extensionsUrl = 'https://geminicli.com/extensions/';
+      const errorMessage = 'Failed to open browser';
+      vi.mocked(open).mockRejectedValue(new Error(errorMessage));
+
+      await exploreAction(mockContext, '');
+
+      expect(mockContext.ui.addItem).toHaveBeenCalledWith(
+        {
+          type: MessageType.ERROR,
+          text: `Failed to open browser. Check out the extensions gallery at ${extensionsUrl}`,
+        },
+        expect.any(Number),
+      );
+    });
+  });
 });
diff --git a/packages/cli/src/ui/commands/extensionsCommand.ts b/packages/cli/src/ui/commands/extensionsCommand.ts
index 612de23cc6d..45ea3e47b67 100644
--- a/packages/cli/src/ui/commands/extensionsCommand.ts
+++ b/packages/cli/src/ui/commands/extensionsCommand.ts
@@ -13,6 +13,8 @@ import {
   type SlashCommand,
   CommandKind,
 } from './types.js';
+import open from 'open';
+import process from 'node:process';
 
 async function listAction(context: CommandContext) {
   const historyItem: HistoryItemExtensionsList = {
@@ -112,6 +114,51 @@ function updateAction(context: CommandContext, args: string): Promise<void> {
   return updateComplete.then((_) => {});
 }
 
+async function exploreAction(context: CommandContext) {
+  const extensionsUrl = 'https://geminicli.com/extensions/';
+
+  // Only check for NODE_ENV for explicit test mode, not for unit test framework
+  if (process.env['NODE_ENV'] === 'test') {
+    context.ui.addItem(
+      {
+        type: MessageType.INFO,
+        text: `Would open extensions page in your browser: ${extensionsUrl} (skipped in test environment)`,
+      },
+      Date.now(),
+    );
+  } else if (
+    process.env['SANDBOX'] &&
+    process.env['SANDBOX'] !== 'sandbox-exec'
+  ) {
+    context.ui.addItem(
+      {
+        type: MessageType.INFO,
+        text: `View available extensions at ${extensionsUrl}`,
+      },
+      Date.now(),
+    );
+  } else {
+    context.ui.addItem(
+      {
+        type: MessageType.INFO,
+        text: `Opening extensions page in your browser: ${extensionsUrl}`,
+      },
+      Date.now(),
+    );
+    try {
+      await open(extensionsUrl);
+    } catch (_error) {
+      context.ui.addItem(
+        {
+          type: MessageType.ERROR,
+          text: `Failed to open browser. Check out the extensions gallery at ${extensionsUrl}`,
+        },
+        Date.now(),
+      );
+    }
+  }
+}
+
 const listExtensionsCommand: SlashCommand = {
   name: 'list',
   description: 'List active extensions',
@@ -141,11 +188,22 @@ const updateExtensionsCommand: SlashCommand = {
   },
 };
 
+const exploreExtensionsCommand: SlashCommand = {
+  name: 'explore',
+  description: 'Open extensions page in your browser',
+  kind: CommandKind.BUILT_IN,
+  action: exploreAction,
+};
+
 export const extensionsCommand: SlashCommand = {
   name: 'extensions',
   description: 'Manage extensions',
   kind: CommandKind.BUILT_IN,
-  subCommands: [listExtensionsCommand, updateExtensionsCommand],
+  subCommands: [
+    listExtensionsCommand,
+    updateExtensionsCommand,
+    exploreExtensionsCommand,
+  ],
   action: (context, args) =>
     // Default to list if no subcommand is provided
     listExtensionsCommand.action!(context, args),