No web browser offers a good out of the box experience.
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.
Mozilla Firefox: Pocket integration, no ad-blocking without extensions.
Brave: Everything related to crypto. Also its start page is horrible.
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.
I like Firefox too and I use it. But OP talks about adblocking and disabled pocket by default, so this is why I commented this.
(Actually I don't even use Librewolf, I have just heard of it)
EDIT: I saw that OP says that configuration files are an issue, so your comment is okay.