I found a small vulnerability within the default web browser, here is the ticket. Submitted last year.
Issue 42647: Android Web Browser, JavaScript Popup Bug. Tested on 11 Jan 2013. Vulnerability on Android OS 4.1.2 jelly-bean on the samsung galaxy s3, this may also work on other phones.
Loop vulnerability in mobiles default browser.
I also created a method, on how to fix the vulnerability.
Type-Security Priority-Medium
Submitted to: Android https://code.google.com/p/android/issues/list
E.g. Was this the correct place, to submit, as the bug is still active. Tested on the Sony Xperia M. 05/11/14.