Epiphany

You may wish to use WebExtensions with epiphany, e.g. for adblock and html5tube.

You need to enable the WebExtensions feature with:

gsettings set org.gnome.Epiphany.web:/org/gnome/epiphany/web/ enable-webextensions true

If you do this, you can install new WebExtensions (as .xpi files) or manage installed WebExtensions in Menu -> Preference -> Extensions.