Happens for me too, Firefox on iOS.

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)

Looks like the issue is that the submitted link is a search for “you.com”, which appears to be a special search result that includes prominent promotion of the Chrome extension, regardless of which browser you’re using. It would probably have been a better idea to submit a link to the landing page or a normal search result.

Aha, that explains a lot!

Same here on Firefox 94.0.1 on MacOS.

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"

Same happens here. Normal search works fine though (using top nav bar)

Latest Firefox mobile, android