Sometimes for testing or troubleshooting, you want to see if a site would work if you changed the user agent eg. Chrome.
This specific website soft-blocks Firefox, but works fine if you set the UA to Chrome: https://england.nhs.attendanywhere.com/
Unless I'm missing something - in Firefox you have to manually type in/edit the User Agent string, or use one of the baked in device profiles:
There's some annoyances with this:
Chrome/Edge makes this much easier:
This would be handy in Firefox and would also save having to install a UA-switcher add-on.