I feel like there is no web browser with a sane default configuration that I can recommend to other people. All browsers are preconfigured in a way that harms the privacy of their users or include services that no one wants such as Pocket and BAT.
Here are my problems with some popular browsers.
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Mozilla Firefox: Pocket integration, no ad-blocking without extensions.
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Brave: Everything related to crypto. Also its start page is horrible.
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Chromium: No ad-blocking without extensions and soon Manifest v3 will cripple all content blockers.
Now, these suboptimal defaults wouldn’t be such a big problem if the configuration files were easy to backup and restore and respected the XDG base directory specification.
Not sure about the encryption tbh. I’ve never used any mail service that properly supported it so haven’t tried.
Any reason why, aside from encryption?
That’s why they have a built in adblocker.
Basically, you don’t want everything be dependant on a central authority - this is a single point of failure. If there’s a big security vulnerability in your web browser, but you use a standalone mail client, your mails are most probably safe.
This also adds up to built-in adblocker - who knows if Vivaldi devs will ever go evil and sneak in exceptions in their adblocker? Or if they will sell their web browser, just like their CEO done so with his previous browser, Opera.