Why Do Chrome Session Cookies Persist After Closing the Browser?

Chrome Session Cookies Persistence Conundrum

Despite attempting to set session cookies with an expiration time, users have encountered an unexpected issue in Chrome: session cookies persist even after the browser is closed and reopened. This behavior differs from Firefox and Opera, where session cookies are deleted upon browser exit.

Root Cause: Chrome's Resume Continuation Setting

Investigation reveals that this atypical behavior stems from Chrome's setting to "Continue where you left off." When this setting is enabled, Chrome retains the session data from previously active tabs, possibly including cookies.

Operating System Variation

Interestingly, the issue manifests differently across operating systems. Session cookies are deleted on Chrome in Windows XP and Ubuntu but inexplicably remain persistent in Mac OSX Lion.

Supporting Evidence and Further Insights

• A bug report has been filed on the Chrome issue tracker, addressing the failure to delete temporary cookies and automatic user logout.
• Issue 128513 in Chromium further investigates the inconsistency in clearing session cookies when closing Chrome processes.
• Issue 128567 emphasizes the preservation of session-only cookies despite their intended purpose.

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