If you want to save tomato seeds for next year, squish them in a container and put a bit of water in it, leave it on the counter for four or five days.
Take off the mildew layer and rinse them, they will all be at the bottom.
Put them on a small plate to dry and move them around every once in a while so they don’t stick too much.
When they are dry put them in a glass jar or paper envelope and put them in a cool, dry place.
Label them or next year you’ll be like me ~ wondering what the heck you’ve got and you’ll have to label them ‘Mystery Seeds’.