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.
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.