The reality of modern social media is strict: If the owner set it to "Friends Only," only their friends can see it.
Ask friends to add you to a shared Google Photos or iCloud album for easier viewing outside of the Facebook interface. facebook photo viewer online
Most of these tools offer a true full-screen or 'slideshow' experience, which is perfect for showing off vacation photos to friends without them seeing your notifications popping up. The reality of modern social media is strict: