Most Popular Mozilla Extension in 2013

Website: http://www.total-toolbar.com/firefox-extension-development.php

Adblock Plus

• Annoyed by adverts? Troubled by tracking? Bothered by banners? Install Adblock Plus now to regain control of the internet and change the way that you view the web.

Video DownloadHelper

• The easy way to download and convert Web videos from hundreds of YouTube-like sites.

• This works also for audio and picture galleries.

Firebug

• Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...

Easy YouTube Video Downloader

• Fastest, easiest & most reliable free YouTube downloader. Highest sound quality available with M4A, MP3, MP4, AAC, FLV and HD formats! Single click, non-intrusive, direct download button works directly within the YouTube page!

Greasemonkey

• Customize the way a web page displays or behaves, by using small bits of JavaScript.