Not always. If something is free, and it is a commercial company offering it, then you are probably the product.

But if the offering is from a not for profit company, a charity, or volunteers building something open source for their enjoyment and to contribute to the community, then you are not the product.

As for Mozilla, I'll leave you to make up your mind. I tend to agree with you and I love Mozilla too (but hope that Iceweasel doesn't have this :)