iOS asks to open tabs that I have opened in Firefox with Safari

So, I don't use Safari, never will. I don't have it opened on my MacBook, but for some reason I keep getting this pop-up at the bottom of my iOS screen when I am in the app switcher. It's trying to open a tab that I have opened in Firefox, on my MacBook, as a Safari Tab on my iPhone. I have Firefox set to be the default browser for both devices.