> Every (major/modern) browser I know of does it to earn income, maybe not
IceCat, not sure about that one.
Ungoogled Chromium does not. Not sure whether that qualifies as "major", but
I would say the same about Icecat.
> But I'm also not sure that IceCat is actively maintained any longer.
It is maintained, and there is a [v68 branch][1] last modified three weeks
ago. However, there has not been an official release of v68. The last I
heard is because Mozilla removed the API use for Icecat's privacy checkboxes,
so an alternative implementation will be needed to keep those checkboxes in
v68 and beyond. Guix currently packages a [preview release][1] of v68 that
is missing the checkboxes but is otherwise a functional and up-to-do (for now
at least, 68ESR reaches EOL in September) Icecat.
[1]: https://git.savannah.gnu.org/cgit/gnuzilla.git/refs/
[2]: https://guix.gnu.org/packages/icecat-68.10.0-guix0-preview1/
