If you are considering quitting your job and you participate in your company's Flexible Spending Account (FSA), before you give notice check with the FSA administrator on the rules for making claims AFTER you leave including how much money is available to you.
Some plans, including the one I participated in with my former employer, let you make claims starting on Jan. 1 for the full-year amount (even though you haven't yet contributed that amount through payroll deduction) as long as the date of service occurred while you were still an employee. In my case, I had some medical expenses that I could have scheduled to occur while I was still an employee. However, I thought I only had available the amount I had contributed. Live and learn!