properly remove history hack script

src/history-hack.js

@@ -1,11 +1,15 @@
-document.head.appendChild(document.createElement('script')).text = `(${
-	function () {
-		// injected DOM script is not a content script anymore,
-		// it can modify objects and functions of the page
-		const _pushState = history.pushState;
-		history.pushState = function (state, title, url) {
-			_pushState.call(this, state, title, url);
-			window.dispatchEvent(new CustomEvent('pushstate-changed', { detail: state }));
-		};
-		// repeat the above for replaceState too
-	}})();`; // remove the DOM script element
+const _script = document.createElement('script');
+_script.text = `(${
+function () {
+	// injected DOM script is not a content script anymore,
+	// it can modify objects and functions of the page
+	const _pushState = history.pushState;
+	history.pushState = function (state, title, url) {
+		_pushState.call(this, state, title, url);
+		window.dispatchEvent(new CustomEvent('pushstate-changed', { detail: state }));
+	};
+	// repeat the above for replaceState too
+}})();`;
+
+document.head.appendChild(_script);
+document.head.removeChild(_script);