Used Firefly for Firefox for Windows?
The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.
Developer’s Description
By Alex Atg2d
A file browser extension. Browse your files as you would on Windows Explorer or Konqueror. Copy your files from one directory to another. Split the view to 2, 3, and 4 as many panes as you like. Easily preview Audio/Video, Documents, PDF, and image files. View Mozilla engine and IE's engine output head to head. xSidebar is required for Seamonkey.
Used Firefly for Firefox for Windows?