Buy a manual for an open source project with great online community and documentation? Nah... Look here http://www.mozilla.org/support/firefox/ and go to their forums if you have specific questions!

Bonne chance

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Liens d'intérêt /Links of interest:
Gnutellaforums en français /The House's rules you have to respect / First search the forum, then create a thread / Free software alternatives! - Logiciels alternatifs gratuits!/