Oh. That's odd. It shouldn't ask you for the Chrome install if you're on Firefox. We can't reproduce that bug. What version of FF are you on?
Edit: it badgers me to install it in Chrome even in mobile Safari.
Edit 2: seems there is a search box on top of the page. It works but I didn't notice it initially because
- the page was so intensely focused on getting me to install a Chrome extension (both in Firefox on iOS and Safari on iOS)
- and the placeholder text ("you.com")looked like a decoration initially (try something like "type here" or something)
I also have privacy.resistFingerprinting enabled, maybe the other commenter does too, and that might muck with things.
Just tested and my reported user-agent is: "Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0"