Dashlane - what is it?

For some reason Dashlane Password manager has taken over my PC?  It has taken over my browser home page, I keep getting popups and I can't figure out where it came from.  One time I think I saw the name Norton on one of the pages, is this a Norton product?  I've clicked on I'm not interested, but the popups keep coming up.  I don't think it is malware, and nothing has shown up on any scans, but it is a nuisance.  Any information on Dashlane?