Zoanoid Try IceCat if you want to control each JavaScript on any web page. IceCat is built on the same kernel as Mozilla Firefox, which is why it resembles this browser not only regarding the functions it offers, but also the interface.
Wikipedia writes (https://en.wikipedia.org/wiki/GNU_IceCat)
GNU IceCat, formerly known as GNU IceWeasel,[3] is a completely free version of the Mozilla Firefox web browser distributed by the GNU Project. It is compatible with Linux, Windows, Android and macOS.[4]
brew search --cask IceCat
==> Casks
licecap
I can't find a macOS IceCat port
I am interested in testing LibreJS and other plugins that block non-free JS.
That's not user friendly :-(
Downloads
The IceCat project does not currently distribute binaries, but the GNU Guix package manager can be used to install IceCat on GNU/Linux systems based on 64-bit AMD/Intel processors.
Guix can also be used to build IceCat source tarballs that are suitable for building IceCat natively for other operating systems.
If you don't use Guix and would like to use IceCat, you could consider maintaining an IceCat package for your distribution. On any POSIX system, IceCat source tarballs can be generated from the corresponding Firefox ESR sources using the scripts available in the Git repository of GNUzilla.