Wow, you get this popup on the site :

    Note: Your browser version is outdated. We recommend using the new Firefox Browser. Download now for free!

My browser is up-to-date, their "download now" link takes you to their own download page with a custom Firefox download. They seem like call center scammer level scum. Wonder why Mozzila is allowing them to use their trademarks like this.

They aren't really in a serious email business.