State of charge issue - Dell laptop

[king1]

Doubt it's windows doing it but stranger things have happened...
is the tickbox below selected in FF settings, would explain it... 

It was ticked and pretty sure I haven't done that purposely recently. Now unticked so hopefully issue resolved. TIA

it's the sort of thing that could have happened with a firefox update, someone probably thought it was a good idea for privacy reasons, or they didn't want to be sued for leaving you auto signins active, so explicitly force you to disable it, which I would guarantee is recorded in some log file or DB somewhere...