The Mozilla Firefox project was created by Dave Hyatt and Blake Ross as an experimental branch of the Mozilla project. The animal shown in the logo is a stylized fox, although "firefox" is considered to be a common name for the Red Panda. The logo was chosen for the purpose of making an impression, while not shouting out with overdone artwork.
Recently, an article featured in showed that photographs in space taken by the showed something really similar to the logo which firefox is using. December 17, 2002 was the date when the photographs were taken.
“Firefox is the second most widely used browser with approximately 30% of worldwide usage share of web browsers”. (http://en.wikipedia.org/wiki/Mozilla_Firefox)