It’s the only browser I have installed besides Safari, and my default browser but instead of just opening the link with my default browser, it advertises these other browsers to me and makes me click ‘Default browser app’ by default. wtf I’ll be turning that off, should have never been a feature.
Set Firefox as your default browser by going to Settings > Firefox > Default Browser App.
Also, by adding your Gmail to iOS, you can get your Google calendars through the Apple Calendar app.