Firefox turned 6 year old today. On Nov'9, 2004, Firefox 1.0 was launched. Since than, Internet changed for ever, Firefox made the Web more secure, faster, standards-compliant and, made the Web open.
Before Firefox there was only Internet Explorer and Netscape -- a war that had no winners and many scrolling marquee losers.
Take a look at the Firefox 1.0 release notes embedded below -- it's a fun trip down memory lane:
Reference: Firefox 1.0 release notes