Free Firefox Add-ons & Plugins for Windows

Download videos from YouTube and Google directly. Unlike VideoDownloader it does not use a proxy page, and unlike Unplug it does not create a layer over the current page. It simply try to get the absolute video path and prompt for download it. This...

Validates HTML documents using the CSE HTML Validator engine for Windows. Requires CSE HTML Validator for...

With the GoPenServer Toolbar you will have GoPenServer related news feeds and links. Built in, there is a Search Box, GoPenServer Project News Feed, GoPenServer links to the various Web services provided by GoPenServer, a GoPenServer chatroom, a link to...

Sender Verification Extension is a Thunderbird extension that will protect you from phishing by comparing the From: address of emails aginst published Sender Policy Framework (SPF), DomainKeys records (albeit in a slightly nonstandard way), and RBLs. The...

Automatically earn cash back on purchases you make while shopping online. We share cash back on hundreds of the most popular shopping Web sites. This program is an add-on to Firefox. Users can generally expect to get about 70% of the total cashback from...

A clean, simple and stylish design for Thunderbird based on the Firefox Whitehart theme. Based on the Firefox Whitehart theme style sporting a clean, simple and stylish design now also available for Thunderbird. This version is the first release on CNET...

Dark burgundy/red with ornamental gold icons for Thunderbird. This version is the first release on CNET Download.com.What is new in this release:This version is the first release on CNET Download.com.Requirements:Windows XP/Vista,...

Dark green and gold theme for Thunderbird. This version is the first release on CNET Download.com.What is new in this release:This version is the first release on CNET Download.com.Requirements:Windows XP/Vista,...

A simple and flat theme, a brighter and light gray version of the 708090 theme for Thunderbird. This version is the first release on CNET Download.com.What is new in this release:This version is the first release on CNET Download.com.Requirements:Windows...

Littlebird for Thunderbird, based on icons from art.gnome.org. This version is the first release on CNET Download.com.What is new in this release:This version is the first release on CNET Download.com.Requirements:Windows XP/Vista,...