I’ve been using Firefox on desktop and mobile exclusively for a number of years now. I will say the experience isn’t perfect but it’s better than using a browser made by a company that is actively hostile to its users.

It is important to take note that you will experience issues with some websites. For example, https://astro.build/ Try scrolling quickly up and down on this page on Firefox vs Chrome (on mobile).

It’s not about preference. It’s about what every single other email client does, including their own on different platforms, and this is even fixed in their upcoming beta of this same app.