まうすじぇすちゃーのれいのやつ抹消

"C:\Users\USER\AppData\Local\Chromium\User Data\Default\Extensions\kdcjmllhmhnnadianfhhnoefgcdbpdap\1.2.1_0\js\bg.js"

window.open("/buy.html","sgbuy","chrome,innerWidth=700,innerHeight=400,left="+(window.screen.width-700)/2+",top="+((window.screen.height-400)/2-50))

を消去