If Apex Classes and Visualforce Pages have any namespace prefix then while assigning permissions user can see the namespace prefix in the table column.

  • Go to the Mass Assign Permission App
  • Then Mass Assign Apex Class Permissions tab and select all required fields
  • And click on Fetch Apex Class Permission Button 
  • Then you will get details like the below image.
  • On the Mass Assign Visualforce Page Permissions tab -  
  • Select all fields and click on the Fetch Visualforce Page Permission Button
  • Then you will get details like the below image.