Firefox was battling a $15 million IRS Problem for 4 years. The IRS problem stemmed from a lucrative search deal with Google. The original search deal was struck with The Mozilla Foundation, a non-profit. Later, the deal was assigned to a wholly owned subsidiary, the Mozilla Corporation (for profit). The IRS problem went back to an audit by the IRS to make sure the non-profit Mozilla paid all the required taxes and complied with other non-profit regulations before the transfer.
The IRS problem was resolved! Mozilla Foundation paid $1.5 million to the IRS – 10% of what the IRS was seeking.
The Moral of the story: Get help with your IRS Problem, you may win!