The saltProfileName function in base/GeckoProfileDirectories.java in Mozilla Firefox through 28.0.1 on Android relies on Android's weak approach to seeding the Math.random function, which makes it easier for attackers to bypass a profile-randomization protection mechanism via a crafted application.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-1592
http://securityintelligence.com/vulnerabilities-firefox-android-overtaking-firefox-profiles/
http://archives.neohapsis.com/archives/bugtraq/2014-03/0153.html