Review for Duplicate Tab by blade-edge
Rated 5 out of 5 stars
USE ADD ON COMPATIBILITY REPORTER (link below) TO ALLOW YOU TO USE DUPLICATE TAB, WORKS ON FF 9.0.1 !!!
https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/
To create your own collections, you must have a Mozilla Add-ons account.