Lightning

Thunderbird add-on that adds personal organizer functions to the application

HTTPS Everywhere

Browse in a more secure manner with the HTTPS protocol

YouTube to MP3

Add the option to download music to YouTube

Sparky Alexa Toolbar

Have Alexa's information in your browser

Privacy Badger

Block adverts that violate your privacy

Foxtana Pro

Have Cortana search Firefox

WebMail for Thunderbird

Use Thunderbird to manage your webmail

feedly

RSS feed reader

Ank Pixiv Tool

Download manga images from Pixiv

User Agent Switcher

Tool to switch the user agent used

IE Tab

View websites as if you visited them with Internet Explorer

Adblock Plus for Firefox

Block Internet adverts

Bookmark Duplicate Detector

Eliminate you duplicate bookmarks from your favorite browser

Autofill Forms

Fill in forms automatically

Web Developer

Toolbar aimed at web programming

Timeline Remove

Disable the new Facebook Timeline

AudioQuick Editor

Quickly learn to edit your audio files

BestPractice

Change the tempo and tone of any song in real time

MP3 Workshop

Work with your MP3 files

Skype Voice Changer

Disguise your voice when using Skype

Magix Audio Cleaning Lab

Digitize your LPs and cassettes obtaining the best sound

PolderbitS Sound Recorder and Editor

Two practical and lightweight audio tools

Acoustica

Edit your audio files with dozens of different tools

Music Editor Free

Complete music editor that offers professional results

mp3DirectCut

A simple and efficient MP3 file editor

Sonic Visualiser

Inspect the contents of your audio files

Sofonesia MP3 Clipper and Joiner

Simple tool to cut and join MP3 files

Voicemeeter

Audio mixer that allows you to change your voice

ACID Xpress

The free version of one of the best sound editors around

MP3Gain

Easily modify the gain of your MP3 files

Kangas Sound Editor

Create your own music from scratch