Homary Test Switcher is a lightweight Chrome extension designed to assist developers and testers in swiftly toggling between different User-Agent strings. This tool features a one-click switch function allowing users to choose from a preset list or customize their own User-Agent. It is particularly beneficial for web front-end and back-end developers, as well as QA testing engineers who require frequent environment changes.

Additionally, the extension includes mobile simulation options, automatically appending '.mobile' for mobile device testing. A unique environment tagging feature displays a red marker in the top right corner of the page when the User-Agent begins with 'test', facilitating easy identification of the current testing environment. Changes take effect immediately after saving and refreshing the page, eliminating the need to restart the browser.