It's convenient having everything in the browser. Multiple tabs. Good password autofill. No sync issues. No complicated set up. Good search functionality. No us

It's convenient having everything in the browser. Multiple tabs. Good password autofill. No sync issues. No complicated set up. Good search functionality. No using up disk space. Don't have to worry about keeping another piece of software (mail client) updated. I use webmail + Firefox containers to access multiple inboxes at the same time. I have like half a dozen email accounts that I access regularly, so it works well.