Firefox to become adware?
In a sense, yes. At an undisclosed time, Firefox will begin showing "new" users sponsored tiles on the tabpage.
source One poster in the forum argues that Mozilla folks have to eat, too. But they already eat quite well from the money the receive from Google. But the problem for isn't that browser is monetized. This shows a decline in integrity on Mozilla's part.
Now why the quotes around "new?" In the developed world, there aren't too many people without internet. For example, as of Dec 2011, the internet penetration in the US was 78.3% of the population, which is actually less than most of the developed world. How many of the remaining 22.7% are young children or the elderly. The US does have more children as percentage of the population than say, the EU or Japan. I believe the internet penetration of emerging market economies such as Mexico ("officially" only only 29.4% as of Dec 10) is vastly under-reported, with the place being littered with crowded internet cafes and the continued growth of 3 and 4G wireless networks as well more deployment of cable and DSL internet. So again, what new users?