use hostname, add close button to frame

extension/background.js

@@ -82,7 +82,7 @@ async function injectForeground() {
   const parsed = new URL(tab.url);
 
   askNative({
-    domain: parsed.host,
+    domain: parsed.hostname,
   }).then(({ results }) => {
     if (results && results.length) {
       currentPageMatches = results;

extension/foreground.js

@@ -161,6 +161,27 @@
       });
     });
     autoFillContainer.appendChild(select);
+
+    const close = document.createElement('button');
+    close.innerText = 'close';
+    Object.assign(close.style, {
+      right: '0',
+      border: '0',
+      position: 'absolute',
+      padding: '0 4px',
+      appearance: 'none',
+      background: 'transparent',
+      fontWeight: 'bold',
+      fontSize: '12px',
+      pointerEvents: 'all'
+    });
+    autoFillContainer.appendChild(close);
+
+    close.addEventListener('click', () => {
+      autoFillContainer.parentElement.removeChild(autoFillContainer);
+      window.removeEventListener('resize', reposition);
+      window.removeEventListener('scroll', reposition);
+    });
   }
 
   function init() {