Display a webpage in Mac lock screen

1. You can download this screensaver which allows you to specify the site you want to display (found there).

2. Turn on the password to make your screensaver to be the lock screen:

   1. Open "System Preferences"

   2. Go to "Security & Privacy"

   

   3. Check "Require password [immediatly] after sleep or screensaver begins"

      

You may be interested in a product my team and I are about to release, called Screensaver Ninja. True to its name, the ninja transforms your screensaver into a rotation of live websites like dashboards, analytics, news, the weather...whatever you need.

Apart from being able to lock your computer as detailed above, you can also choose to lock the screensaver so that whilst everyone can view the data, you must have a keycode to access it.