Packages with the nsplugin use flag

Global definition: Build plugin for browsers supporting the Netscape plugin architecture (that is almost any modern browser).

app-text / evince : Simple document viewer for GNOME

dev-qt / qtwebkit : WebKit rendering library for the Qt5 framework (deprecated)

media-gfx / freewrl : VRML97 and X3D compliant browser, library, and web-browser plugin

www-plugins / lightspark : High performance flash player