This is a great, simple, and robust application. 5-stars for my needs.
Several shortcomings: The user agents are not that up-to-date. currently, i am using fierfox 112 but the add-on shows a user agent up to firefox 108. not a big deal; i can edit that manually but i preferred if the add-on automatically updated that info.
I'd also like there to be a mode for the extension to auto-apply the most used user agents out there on the web.