Auto front-end login is a simple Joomla! plugin which allows automatically convert front-end Joomla! session to authorized one when the back-end session exists and it is active.
No additional plugins or hacks, just one Joomla! system plugin.
Auto Front-end login to authorize front-end user based on back-end session. Authorization process detect back-end session and change currrent PHP session object by loading JUser details to 'user' field. Plugin works only on front-end to avoid session duplicates.
Using onAfterInitialise() trigger gives sure that front-end session already exists (as guest) so it may be easily transform into front-end sesssion without creating new session record.