First section is dictionary, second section is "Siri Suggested Websites." These entries have Firefox logo and open Firefox when clicked.
Firefox on iphone is just webkit. It is not actually Firefox.
Chrome on iphone is just webkit. It is not actually Chrome.
Chrome on iPhone is Chrome on iPhone, but it uses WebKit instead of Blink.
The reason this is important for you to keep in mind is because Firefox is whatever Mozilla says Firefox is, and Chrome is whatever Google says Chrome is. There's no reason to suppose the iPhone version of some product should share any code with the Android version of the same product.
I’m saying the people at MS promoting this in this particular way are, well, dumb.
But as a user wow is it the most trashy and abusive program I routinely encounter. Start it for the first time and you're confronted with tabloid news and advertising. Sponsored links are mixed into your frequently visited sites by default. It injects itself into your online shopping and sends all your images and browser behavior to their servers for various weak justifications. You can turn it into a passable experience by scrolling through and configuring something in nearly every single settings tab, but then they just ignore you and inject new advertising sidebars or icons in a random update. Keeping it restricted to "just a browser" requires constant vigilance. It's clearly first and foremost just an advertising revenue funnel for Microsoft, which is completely pathetic of them. At least IE was mostly just a browser even if it did that pretty badly most years.
I cannot replicate, it opens Firefox for me BUT it completely disregards my search engine choice, so it opens Google even though Kagi is my default search engine.
Yet, whenever I want to search for a highlighted word, it opens Safari. This is such an absurd situation where I am browsing a site and want to do a search for something I just read and, instead of just opening a new tab or replacing the active tab with a web search, it opens a different browser app I do not want to use.
This is just not the way any reasonable user would expect a system app to behave once all browser selection settings are configured to use a different browser.