Here is a simple trick to help you easily find the list of modules and plugins installed on your Safari browser.
Under Windows
The display modules (or plugins) can be installed in different ways.
With Safari
The most simple, in the menu of your browser: Help / modules installed
An internal html page appears with a list of modules installed.
This page has the advantage of names module and other information, including file names and links to downloads.
With Windows Explorer
C: \ Program Files \ Safari \ Plugins \
Download the main plugins
Bookmarks