Seriously, that stuff is delicious! Don't throw it out.

Add it to cornbread, use it to fry vegetables, put it on popcorn, use it to season your cast iron... The list goes on and on. And it keeps almost indefinitely in the fridge thanks to all the salt. There is almost no reason I can think of to throw out bacon grease unless you eat so much bacon that you can't possibly keep up with the grease or you don't have a refrigerator.