User Agent Masquerade
Adds a button to the toolbar to switch the User-Agent header.
What is User Agent Masquerade?
User Agent Masquerade is a Firefox add-on that adds a button to the toolbar, allowing users to easily switch the User-Agent header. By enabling svg.context-properties.content.enabled in about:config, users can also customize the icons' color to match their theme context.
To use icons color of the theme context, set svg.context-properties.content.enabled to true in about:config.
User Agent Masquerade is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install User Agent Masquerade if you trust the publisher.
User Agent Masquerade has earned a fairly good reputation and likely can be trusted.