Some sites (namely Steam Community Market) require the user to manually check a specific checkbox for repetitive actions like buying items. I’d like to have that checkbox always checked. URL: http://steamcommunity.com/market/listings/730/USP-S%20%7C%20Torque%20(Field-Tested) element: <input id=”market_buynow_dialog_accept_ssa” type=”checkbox” value=”0″ name=”accept_ssa”> Can that be done with Tampermonkey? I found document.getElementById(“checkbox”).checked = true; which seems logical to me. I put it in a new Tampermonkey