SGDB-Extension/script.js

const url = window.location.href;
const appIDMatch = url.match(/\/app\/(\d+)/);
if(appIDMatch) {
	
	const appID = appIDMatch[1];
	
	const sgdb_button = document.createElement('a');
	sgdb_button.href = `https://steamgriddb.com/steam/${appID}`;
	sgdb_button.className = "btnv6_blue_hoverfade btn_medium";
	
	const span = document.createElement('span');
	span.setAttribute("data-tooltip-text", "View on SteamGridDB");
	
	const icon = document.createElement("img");
	icon.className = "ico16";
	icon.src = browser.runtime.getURL("icons/sgdb_16.png");
	icon.style.backgroundImage = "none";
	span.append(icon);
	
	sgdb_button.append(span);
	
	const buttonContainer = document.querySelector(".apphub_OtherSiteInfo");
	if(buttonContainer) {
		sgdb_button.style.marginRight = "3px";
		sgdb_button.style.marginLeft = "3px";
		buttonContainer.prepend(sgdb_button);
	}
	
}