# Start Web Browser Block Fails When Using Extensions Without Selenium Enabled

## Introduction

If you're trying to use the **Start Web Browser block with Extensions enabled but Selenium left unchecked**, you might be facing an error: " **Chrome extension host service could not be started**" as highlighted in the image below:

In this article, you will learn **how to configure the Start options field when you’re trying to launch Chrome without Selenium** in Leapwork and avoid errors. When the Selenium checkbox is unchecked, and you're using extensions, you need to add the following details in the Start options field:

--disable-features=DisableLoadExtensionCommandLineSwitch

## Steps:

1. Drag in the Start Web Browser block.
   
   
   
2. Select **Chrome** as the browser.
   
   
   
3. Expand Start web browser block and **uncheck the Selenium checkbox**.
   
   
   
4. Paste the **above highlighted details** into the Start options field.

This will ensure that Chrome allows the Leapwork extension to load properly without any challenges.

If you have any questions, please contact [Priority Support](mailto:prioritysupport@leapwork.com).