Should you quit your job if you know they are looking for your replacement?

I had this happen to me and took measures to ensure that if I were fired, they wouldn't have a leg to stand on. I copied everything in my employee file, all of the pay raise letters I had received, letters from customers thanking me for helping them etc. Then I started documenting everything that went on with expense reports, the grifting that the bosses were doing and the yearly tax records. A few weeks later I was called into the office to be told that I was no longer needed at the company and I was to clean out my area and leave within the hour. I smiled, called my lawyer and told him that I'd been scaked and he laughed. I demanded that they put my termination in writing and their reason was poor customer care, complaints from customers and being late every day. Thankfully I made copies of ALL the time cards and contacted the payroll company to have them send me their copies. I ended up suing them for a large chunk of money, slander and the vacation and personal time that was due to me. I came out on top because they had absolutely no idea that I had photocopied all my records. When the judge asked them about all the things that were in my employee file, they handed him a very thin file folder. What ever good things were in there had been removed. The judge, extremely ticked by this point in time, started calling customers that had writtten letters to the company about me. When he was convinced that they weren't on the level about things, he awarded me about three grand more than I asked for, as well as making my former company pay my legal fees. If you think you are going to get sacked, start to protect yourself and don't be afraid to contact a lawyer. Companies think that they won't get in trouble but they have labor laws that they have to abide by.

I will leave before they will fire me because its hard to be fired and many people will make bad comments about you so its better if you go out before the war begins.