Thank you for your response and technical analysis instead of reciting best practices.  I am convinced that it had to be connected to me logging in via chrome on my phone. I don't think my phone's Chrome browser has any extensions but it certainly has plenty of cookies. The timing of the transaction is very curious. It is not like my credentials were stolen and it was sent in the middle of the night. It was sent only when I was logged in and the first time I logged in on my phone.  Very good advice by another responder to simply check the balance on the blockchain and not logging in - duh. Lessoned learned. This was not my main wallet (I have hardware and paper wallets) it was just a wallet I use to mine to years ago and it only had a few hundred dollars in it. Which turned to a thousand dollars, and this past weekend it turned into five thousand. Oh well.  "Hope you can recover it somehow"  If only.