How do I remove keyboard shortcuts?

I was just working on an eBay listing and I pressed the "delete" key when the cursor was not in a field and it made my browser go back a page. In doing this, I lost an ENTIRE LISTING WORTH OF WORK! This is such an annoying feature! I don't want my delete key to do anything except delete text. How can I disable this feature that makes the delete key perform the same function as the "back arrow". For example, if the cursor was out of this box right now and I pressed "delete" by accident, I would have to re-type all of this text! This is a stupid feature. Please tell me, how do I disable it?

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