Firefox 12

Firefox 12 is the final official version of Firefox to officially support Windows 2000. This Firefox version will run just fine on Vanilla Windows 2000 systems without any extra tricks required. However, be weary of SSL and TLS errors due to the age of Firefox 12; Firefox 12 does not support TLS 1.2. So, a proxy might be required to access certain pages.

Features:
-Supports Windows 2000
-Compatible with NPAPI plugins (flash player & java)
-Customizable GUI
-Many character encoding options
-Add-ons available
-Working offline available
-and more!

Requirements:
Windows 2000 or later

Components:
Firefox Setup 12.0

Screenshots: