Around 10 years ago, a member of either Team Camaro or Pro-Touring.com died when a pickup truck he was under fell on him. His wife came home from work and found him pinned under it. We took up a collection to help her with funeral expenses.
It's best to focus on prevention, use good quality four leg jack stands instead of 3, and the higher capacity stands have wider spaced feet for more stability. Your floor jack should have a rubber pad on it so it doesn't slip. Clean up your workspace so you don't trip over junk. The best advice is always take time for safety, and always THINK SAFETY. Bad things happen when you hurry and take short cuts. A friend was drilling holes, cut his finger so he wrapped a shop rag around the finger and kept drilling. The rag snagged on the drill and it pulled his finger off! The doctors could not re-attach it. An employee on our farm came to work with a chipped tooth, he was washing parts in his garage, passed out from the fumes and hit the floor. He was using Gasoline. I gave him a container of Naptha which is what we use to clean parts, it's Combustible not Flammable. I test poured Naptha on my welding bench and put a torch on it. It will burn with the torch on it but not ignite and burn on it's own unless it's absorbed into a rag or paper towel.
My cousin works on a nearby farm, he smelled gas from one of their trucks and told the operator to get it fixed right away. Nothing was done and the next day, the truck burst into flames and was heavily damaged. The point is, to use good quality fuel hoses and fittings, and don't ignore the warning signs.
Garage Fire Safety Video
https://www.youtube.com/watch?v=SbLb3blQu7Y
Around my shop I place extra fire extinguishers, high up so I can see them. I put extra safety glasses face shields and work gloves near my machinery so I don't have to go looking for them. It's very tempting to grind on something without protection when you are in a hurry. I put warning stickers on my bench grinders to remind me and others to use protection. I have plenty of good jack stands, got rid of the cheap ones. Set your place up so it's very easy to be safe.
Another thing to do is to do a safety survey around your garage. Remove as much flammable material, paint thinners, fuel cans, cardboard or paper as you can. Especially around any weld or fab areas. Look at your extension cords for fraying or wear, air hoses too. Pretend you are an OSHA inspector and give it a hard look, or invite someone else to critique your work area for things you missed. Winter is a great time to do it.