The Internal Web Browser allows you to open a browser inside of your environment. The Internal Web Browser is only available in the Web Browser Tools Perspective. To open it go to Window | Open Perspective | Web Browser Tools. To open a web page in the browser click from the main toolbar.
The options for handling popup windows are:
Open in new browser editor - Opens the popup window in a new browser editor allowing the use of the browser tools.
Open as a dialog - Opens the popup window in a separate window.
Ignore - Does not open the popup window.
Prompt - Allows you to choose whether to Open as Editor, Open as Dialog, or Ignore for each popup window the browser detects.