As explained by Orivej (reformatted from Markdown):
> These (except libsignal-protocol-c) are private dependencies of the
> actual dependencies that should neither be propagated nor added
> manually to dino. For example, libpsl and brotli come from
> libsoup-2.4.pc:
>
> Requires: glib-2.0 >= 2.38, gobject-2.0 >= 2.38, gio-2.0 >= 2.38
> Requires.private: libxml-2.0, sqlite3, libpsl >= 0.20, libbrotlidec, zlib
>
> (To be precise, glib uses utillinuxMinimal rather than utillinux.)
>
> The warnings we see, such as Package 'mount', required by 'gio-2.0',
> not found, come from CMake running both pkg-config --libs and
> pkg-config --static --libs to populate both <XXX>_LIBRARIES and
> <XXX>_STATIC_LIBRARIES[1], but dino has no use for the latter.
> Currently these warnings can not be disabled:
> https://gitlab.kitware.com/cmake/cmake/issues/18158
>
> (They could be prevented by pruning Requires.private from shared-only
> libraries akin to <https://github.com/NixOS/nixpkgs/pull/51767>,
> although it can not be detected if a library is shared-only from the
> .pc file alone, and this is just a warning.)
>
> [1]: docs: https://cmake.org/cmake/help/v3.16/module/FindPkgConfig.html
with firefox 64 being the latest version, and the removal of
"tor-browser/icecat-like" variants, we can greatly simplify the common
firefox derivation.
firefoxPackages.firefox-esr-52 was removed as it's an unsupported ESR
with open security issues. If you need it because you need to run some
plugins not having been ported to WebExtensions API, import it from an
older nixpkgs checkout still containing it.
There's not really a reason to ship an unsupported ESR variant of
firefox, and if one really needs it, it's also possible to just checkout
an older version of nixpkgs.
