The Mozilla Foundation takes FireFox security seriously - so seriously, in fact, that they have offered the sum of 2,500 USD to a bug hunter whose task was to discover the vulnerabilities of the open-source browser. The "Bug Bounty program" rewarding system has already rewarded a German specialist with 500 USD for each of the five security breaches discovered.
The Mozilla Foundation is one of the few organizations that offer financial compensations for the users who track security vulnerabilities. Microsoft, for example, a company whose size and financial possibilities greatly surpass Mozilla's, relies only on a team of o beta-testers who tests the programs without being rewarded in any way. And Microsoft's programs are everything but free, the testers can be at least be stimulated by a price reduction or bonuses for its programs.