Maybe a little, but not by much. They're better than nothing, but don't confuse them with a degree.
As pointed out, there is no standard for what a certificate is. It's not like having a degree from a university where you can count on everyone having a BS in computer science is going to have a basic level of competence is some obvious subjects.
A certificate is just a piece of paper that someone printed up. The interviewer has no idea what the coursework entailed (unless they participated in the program). They also know that with an online certificate there is no face to face so the certificate grantor doesn't even know for sure who did the work. I'm not trying to get down on fCC, but one potential weakness is that if someone was so minded, they could cut and paste all the code from other sources, maybe making a few alterations here and there. Without some in depth checking, how would anyone know? Really, if I wanted, I could make my own company and just start selling certificates online. Why not, people do it with degrees?
So, no, certificates are not golden tickets to get the job. I think of them more for me, as milestones on my journey. I still say list them on your resume. And if the interviewer asks about your education, mention them, by all means. But don't think they are the equivalent of a degree. I think you will embarrass yourself if you act like you think that internet certificate is going to impress anyone to any great degree.
As mentioned before, what is going to impress them more is your portfolio and your experience. I would focus more on that. The certificate programs are just a way to build those.
Be proud of your certificates. Even list them where appropriate. But realize that your portfolio and experience are what will matter most to others.