Disable browser caching
Going back in browser history still reveals some private content such as the dashboard.
In addition even public content is enriched with private elements when the user is logged in. For example the main menu has drop downs listing the users groups.
To prevent leaking private information on shared browsing sessions we should disable caching for logged in users entirely.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information