You'd want some kind of mini breaker, not a fuse. You'd be replacing a lost of fuses.
GFCIs are probably a good idea if you're plugging anything in when it's wet. What else do they get used for?
What amperage is the breaker for your outlet? and is anything else on the circuit?
If your extension cord is too light of gauge, you'll get a voltage (and therefore current too) drop under load, which will mean the motor can't make the power it needs to. The longer your extension cord, the worse this will be. If you keep the load light, you don't need to worry about it. You can do that by not letting the grass grow too long, not mowing when the grass is wet, and/or by taking extra time when you do have to.
Or you can find yourself a heavier gauge extension cord. (But that doesn't mean the circuit will be able to keep up with the demand.) You've probably got a 16 gauge of at least 50 feet. A 12 gauge is what I'd want for something that could routinely pull 15+ amps. I found my 12 gauge extension cords at Costco for cheap.
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