I second tampermonkey. I believe the lemmytools user script available in greasyfork does this already though.

https://greasyfork.org/en/scripts/469169-lemmytools

They kind of have an unfortunate name for an emulator. It sounds like exactly what Nintendo is going to do to them.

Oh man. I live not too far from a Walmart (about 3 miles by car, but 1 by foot with shortcuts). Recently, someone in my neighborhood has started walking to Walmart, filling their cart, then just bringing the cart home with them and abandoning it on the access road in our neighborhood. We are 6 carts deep and my anger towards the perpetrator grows every day.

Have you heard of our Lord and Savior, obsidian?