Hi here is a link to an app that invented called "MULTI WEB SITE" is an app that will allow you to have up to 4 different web pages open on one screen, but to understand what I am telling a little better please watch it , consists of two languages ​​English and Spanish.
thank you!
https://play.google.com/store/apps/details?id=appinventor.ai_ezemax128.Multi_Web
thank you!
https://play.google.com/store/apps/details?id=appinventor.ai_ezemax128.Multi_Web