I have an e4 application and I want to just pull in the eclipse->preferences -> General -> Web Browser preference page into my application. Is that possible?
No, for a pure e4 application this preference page is not available (nor are any of the others that use IWorkbenchPreferencePage).
In addition the web browser code this preference page configures is also not available in an e4 application.
In general anything in most org.eclipse.ui.xxxx plugins is not available to a pure e4 application.