Add port www/xpi-infolister:

InfoLister is an extension for Mozilla Firefox, Mozilla Thunderbird,
and Nvu that collects various information about Firefox/Thunderbird
and saves it to a file. Currently it prints the list of installed
extensions, themes and plugins.

WWW: http://mozilla.doslash.org/infolister/
Author: Nickolay Ponomarev <asqueella@gmail.com>