Firefox Plugin | User agent changer
User Agent Changer 2.6.8
Download link:
https://addons.mozilla.org/en-US/firefox/addon/user-agent-changer/
OR
Add to Firefox
Plugin comes with default user agents. Go to below link save the XML in a file, import it in the Plugin.
https://github.com/hshanbhag/User-agent-xml/blob/master/UserAgentXML.xml
Steps...