A new version, 1.9.9, of the useful program EtreCheck is available:
https://www.macupdate.com/app/mac/48217/etrecheck
This new version now contains links (entitled Support) for a number of things it reports on. For example, I use Firefox as my browser, and one of the Internet Plug-Ins I have installed is VLC Plugin. It shows the version of that plug in, 1.1.5, and a link entitled Support.