Hello @jafwatt,
My name is Henry Eduardo and I am happy to assist with your inquiry, and appreciate you contacting LastPass Support!
I am sorry about the issues you are having with the extension. Can you please check if your browser is configured to delete the cookies when all the browser windows are closed? If so, please either disable that setting or add lastpass.com as an exception.
If the issue persists or if the setting was disabled, please follow the steps from this article and then verify if your browser stays logged in.
Please let me know if this worked or if further assistance is required.
Thank you,
Henry Eduardo | Customer Care