""(and a lot of lies in that marketing - 'fast safe secure'? Firefox is none of them, when compared to other browsers)""
You are seriously accusing Mozilla of lying for marketing, after the stunt the IE team pulled a couple of days ago? - Everybody "sugar-coats" their products for marketing, but there is a big difference between covering your own black-eye up with makeup and punching the guy next to you to try and draw attention away from your own injuries. -- Which is exactly what the IE team did to Chrome not three days ago.
But yea, lets examine those "lies" you mentioned, shall we?
Fast: Compared to IE? Hell yea. No question. - Compared to Chrome, Safari or Opera... depends on who's current release is younger. -- For evidence, try a Google search. In fact, allow me to get you started... This one, for example: http://sixrevisions.com/infographs/browser-performance/
-- To the IE fanbois: Yes, IE is slow. IE8 is like an old Mini compared to the high-performance racing-brooms that are the standards-supporting browsers. And IE9 is still like 2 years from being a reality. (By which time it'll be just as slow as IE8 is now, relative to the others.) -- It's the trade-off for Microsoft's business model; catering to the businesses with long-interval releases, rather than to the people, with rapid releases. IE9 would actually do fine (in regards to speed) if released today, but it won't be due to them not wanting minor releases. - It's easier for the business world to deal with software that isn't upgraded to often (see IE6's market-share if you question that sad reality).
Secure: The internet isn't secure, but in relative terms Firefox is a good choice. As bad people tend to want to hurt as many people as possible with as little effort as possible, the browser most likely to become a victim of an attack is the one with the largest market share... It's an classic argument that you've probably heard a thousand times before, but for good reason. -- But then again, Firefox has a much much faster response time to threats than IE, so you could up it's "security ratio" by a few % just on that. (I'd cite the recent "Aurora" attacks, as an example.) - Relative to it's standards-supporting colleges, Firefox shares a very similar security policy (open-source), with the exception of Opera of course. You'd have a hard time getting a good answer to which is *more* secure.
Safe: What exactly do you mean? No sharp corners to hurt yourself on? How is this different from "Secure"? (And did they actually use this word?.. I must have missed that particular ad.)