Not really, since they never found a proper business model. So far, how do they make money? How do they pay the developers? How do they plan to be sustainable? Is there any place where I can see who donated them? Which share of donations is given by large companies that are constantly breaking the values the Mozilla foundation stands for? Was the news that Google will pay $400M per year to be the default search engine confirmed? If so, which share of their budget does this represent?
A lot of questions are not answered, which makes the whole FF a bit shady. As a user, how much can I trust FF as a browser? Before answering, keep in mind that the browser is the single most important software we use every day since it carries most of our activities. Is it safe to use software made by someone who is not capable of sustaining themselves?