User-Agent Switcher and Manager is a free Chrome extension developed by rynu.smith. It falls under the category of Browsers and is listed as an Add-ons & Tools subcategory.

This extension allows users to spoof their browser's "user-agent" string to a custom designation, providing privacy and preventing websites from gathering specific details about their browsing arrangement. With this extension, users can easily set custom user-agent strings from the toolbar popup, enabling them to indicate that they are on a mobile device, for example, and view mobile versions of websites for faster loading times.

The extension uses a two-factor technique to mimic the default user-agent string, ensuring reliability. It does not consume any resources when not spoofing the user-agent. Users can also set per-site user-agent strings and have a separate user-agent string for each browser window. Additionally, there is an option to randomize user-agent strings for added privacy.