When opening Chrome (or probably any other browser that supports the LastPass extension) and a user is logged in, the extension is active (red icon with the three dots). When clicking on the extension icon, there is the menu item "Open My Vault" for accessing the complete vault, without the need to bypass any other barrier.
I consider this a potential security risk. Assuming that a user may leave her computer unattended for a short time, a person passing by could access with a single click the complete vault.
Hence my request: add an option to require entering the master password again when opening the vault.