What I meant by that, Kadri, is mainly Mozilla's removal of your right to, for example, clean your own browsing history, remove highlighted visited sites, etc.
Since FF3 there is a fair outcry of this, with no solution that I found. I noticed when i tried tidying my computer up once that even removing every trace of your history/visited sites(directly in FF and in Windows) that FF is still storing all those sites for you. Visited links will still be purple, traces are left everywhere, it just isn't doing what it tells you it is.
If you don't mind people/programs lying to you when their supposedly doing tasks that you personally selected them to then, no big deal. I just don't like the idea of a previously very trustworthy program becoming a kind of spyware, data collecting program. Not cool.
Chrome leaves you in control.