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I have been logged-in into stackoverflow in Chrome browser with my Google credentials and then I open stackoverflow in Firefox Developer Edition browser and tried to login again in Firefox with Google credentials. I have been automatically logged-in. I clicked to log out and after logout when try to login with Google credentials, I have been automatically logged-in again. As per my knowledge, Firefox and Google chrome doesn't share the session.

  • So, I am curious to know whether this new FDE browser share session with chrome or is it the feature of StackExchange?
user226817
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No. Firefox/Chrome doesn't share sessions. Auto relogin is feature of Stackexchange. You can completely uninstall one of the browsers, clear cache and retry and this will still work.

Firefox/Chrome uses entirely different browser engines. Firefox based on Gecko and Chrome is based on Blink - each with it's own data storage formats. They may use sqlite, but Chrome still saves secure passwords with operating system security features like keystore in osx. Firefox saves password internally. Even if they wanted to, for data exchange both browser would need to arrive at a common data exchange formats with a LOT of security implications.

kiranpradeep
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