Comment 5 for bug 898496

This issue is getting more pressing every day since there are >100 known security issues in WebKit1 (for Gtk+). WebKit2 for Gtk+ doesn't have these issues. See https://blogs.gnome.org/mcatanzaro/2016/02/01/on-webkit-security-updates/ for details.

Browser plugins are less important every day and are discouraged by every major browser vendor for security reasons anyway. Usually browser plugin vendors don't care much about browser plugin security.