As a developer I can say LT browser is the perfect tool to help you write clean code and get to a point where the website would be responsive. One of the core reasons for this is the ability to test your website locally without having to install any extension. Just type in the localhost URL and you can view the website. This feature has been very helpful for me to write better code and also our test team, as the UI is very neat and offers a device comparison view. Additional points to the inbuilt debugging, where errors can be changed and validated on the go.