Up & Coming Extensions

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Decentraleyes No Restart

Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.

Rated 5 out of 5 stars (57)
40,706 users

Live HTTP Headers (Fixed By ITWorld.com.pk)

View HTTP headers of a page and while browsing.
Live HTTP Header Fix By Danyial ITs Working On Firefox Again Fixed Reply Problem

Rated 4 out of 5 stars (5)
2,172 users

True Full Screen in SeaMonkey No Restart

This extension enables true full screen mode in SeaMonkey for HTML5 video players, slide-shows, etc. and also for full screen invoked manually with the F11 key.

Rated 5 out of 5 stars (16)
3,928 users

Easiest YouTube Video Downloader No Restart

This Addon simply adds a dropdown button that lets you download YouTube Videos in various Formats. Download YouTube Videos in FLV, 3GP, MP3, MP4, 720p, 1080p in a single click.

Rated 3 out of 5 stars (33)
39,437 users

Browser View Plus

Open links, pages, and bookmarks in any other browser or media player. Modify any menu, browser name or location. Incognito/private browsing mode is also supported. Works for all Firefox locales/languages.

Rated 5 out of 5 stars (20)
1,048 users

Add-ons Manager - Version Number No Restart

Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.

Rated 5 out of 5 stars (18)
1,576 users

Open With Opera No Restart

Open With Opera sends pages, links, tabs and images from Mozilla Firefox to Opera.

Rated 5 out of 5 stars (4)
1,333 users

Imagus No Restart

Enlarge thumbnails, and show images/videos from links with a mouse hover.

Rated 4 out of 5 stars (65)
17,065 users

MP4 YouTube Downloader

This simple add-on allows you to download MP4 (iPod-compatible) videos from YouTube, Dailymotion, and Vimeo.

Rated 4 out of 5 stars (62)
67,106 users

PlayFlash 32bit

Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.

Rated 5 out of 5 stars (4)
2,482 users

Open Multiple Locations

Adds a "File" menu option to open multiple locations at a time.

Rated 4 out of 5 stars (20)
4,848 users

Easy Youtube Video Downloader Express No Restart

Only one with 1080p Full-HD and 192kbps MP3 Direct Links. A clean, fast and simple addon for superfast and easy downloads in FLV,3GP,MP3,MP4,720p, 1080p qualities on Youtube pages.

Rated 4 out of 5 stars (888)
304,850 users

Youtube Best Video Downloader 2 - MP3 MP4 M4A AAC No Restart

Now with 1080p Full-HD Support!

Download every YouTube video you want and you can download them as Full-HD MP4, FLV, 3GP, MP3, M4A and AAC formats. Easy & Fast!

Rated 3 out of 5 stars (44)
116,375 users

Cookie Exporter

Exports all cookies in IE manner.
Makes a Netscape standard cookies.txt file.
Very useful for WGET --load-cookies option.

Rated 5 out of 5 stars (13)
4,715 users

Dorando keyconfig

A modified Dorando's tool to rebind keys in Mozilla apps. It is designed to be a drop-in replacement, and will keep your old settings. (See details for upgrade instructions.)

As of version 2016.2, Custom keys (using custom JavaScript) works again!

Rated 5 out of 5 stars (14)
1,439 users

Extension List Dumper 2

This extension adds a button ("Dump list") to the Add-ons window. When this button is pressed, a new window is opened with the list of installed extensions, themes or plugins...

Rated 4 out of 5 stars (30)
1,197 users

Menu Wizard

Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (177)
55,344 users

YouTube Video Download & Convert No Restart

YouTube Video Download and Convert is the powerful add-on that lets you collect all media information available on YouTube. Advanced power panel lets you download, preview, play with and convert all media right inside Firefox.

Rated 3 out of 5 stars (5)
48,371 users

Speed Start No Restart

Speed Dial & Start Page with flexible layout for fast access to sites via visual bookmarks

Rated 5 out of 5 stars (36)
5,574 users

Cookie Importer

Imports cookies from a textfile.
Reads Netscape standard cookies.txt files as exported by IE and others.
Very useful in combination with the Cookie Exporter add-on.

Rated 5 out of 5 stars (2)
6,999 users