Federal Firefighters Fairness Act of 2007 - Amends federal law to provide that, with regard to an employee in fire protection activities: (1) heart disease, lung disease, specified cancers and infectious diseases shall be presumed to be proximately caused by the employee's employment; (2) the disability or death of an employee in fire protection activities due to such a disease shall be presumed to result from personal injury sustained while in the performance of such employee's duty; and (3) such presumptions may be rebutted by a preponderance of the evidence.