I want on a website simultaneously with two account login? You no longer need to use more than one browser or a browser with a stealth mode of a normal mode.
Mozilla inFirefox 50(Nightly edition)Introduced an experimental feature called containerIt allows users to log in at the same site at the same time more than one account. Mozilla security engineer, said this feature helps to improve the security and privacy, but also convenient for users. cookie and cache data are independent of each container.