I came here to discuss this. It probably doesn't need to be said, but the brains behind this marketing don't understand their users... assuming they are actually targeting Firefox.

My guess would be that Firefox users mostly consist of people that know enough to not use Chrome or a Microsoft browser. And an ad won't change that. Chrome is the new IE as far as the default that everyone uses, so it would make sense if they targeted them.

"Get the same browsing experience with better integration with Windows." (That's probably not true, but this is advertising, which never stopped anyone.)

I think the article just sited an anecdotal example from one user who had Firefox installed. Maybe others with Chrome see Chrome instead? Or maybe ms is trying to play nice with Google to make edge chromium development easier.