Best Duplicate Mozilla Addons Alternatives

Opens a duplicate of the selected tab, similar to Duplicate Slide Command in Power Point

A simple and clean add-on that lets you duplicate your current tab X amount of times.

Closes duplicate and empty tabs. Uses control+shift+d as the keyboard shortcut to do it.

Select actions for various clicking events on a tab or the tab...

Adds a Duplicate this tab option to the context menu.

This button duplicates current tab. Similar to 'duplicate tab' in context menu in chrome. Simple and clear)

Simply adds 'Duplicate Tab' to tab context menu.

A Duplicate Tab Hotkey bound to Accel+D.

Fork of https://addons.mozilla.org/en-US/firefox/addon/duplicate-tab-hotkey but with changed hotkey.

Duplicate Tab allows you to clone a tab along with its...

How many times you have felt a need to open same webpage in new tab so that you can view two things of it simultaneously.
Copying and pasting the URL is very tedious here comes a plugin to your rescue. Just right click and tadda tab duplicated..

Check for canonical links on the loaded page.

Scans for bookmark duplicates and allows you to delete them

Open Bookmarks/History/Homepage/URL/Search in new tabs, and more utilities for tabbed browsing, including Protect/Lock/Faviconize/Unload Tab, Reload Every, Select and manipulate multiple tabs simultaneously, Tab Stacking/Coloring, etc.

Hide unnecessary items in the bookmarks menu.

This is an extension meant for AMO reviewers with the following features:
* Close duplicate review queue tabs when a new one is loaded
* Automatically close validation reports and file viewer tabs when closing a review tab

Enable you to sleep/duplicate/placehold/kill multiple tabs at a time.