diff --git a/package.json b/package.json
index 43b163d..e38eca4 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "publisher": "djnicholson",
   "displayName": "Automatic web panel opener - webpanel.json",
   "description": "Automatically opens web panels according to the webpanel.json file in the current workspace.",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "icon": "resources/logo.png",
   "galleryBanner": {
     "color": "#000000",
diff --git a/src/extension/index.ts b/src/extension/index.ts
index f79f12b..e938aba 100644
--- a/src/extension/index.ts
+++ b/src/extension/index.ts
@@ -3,125 +3,142 @@ import * as nodeFetch from "node-fetch";
 import * as path from "path";
 import * as vscode from "vscode";
 
+const PATTERN = "**/.vscode/webpanel.json";
+
+const FLAG_ACCEPTING_MESSAGES = "accepting-messages";
+const FLAG_PANEL_UP = "panel-up";
+
 let fileSystemWatcher: vscode.FileSystemWatcher | null = null;
 
 let panelsByUrl: { [url: string]: vscode.WebviewPanel } = {};
 
-let active = false;
-
 let context: vscode.ExtensionContext | null = null;
 
-let loading: { url: string; panel: vscode.WebviewPanel }[] = [];
+let urls: {
+  [url: string]: boolean;
+} = {};
 
 function ensurePanel(url: string) {
-  if (!active || !context) {
+  if (!context) {
     return;
   }
   const existingPanel = panelsByUrl[url];
-  if (!existingPanel || !existingPanel.visible) {
-    const newPanel = vscode.window.createWebviewPanel(
-      `web-panel-${url}`,
-      url,
-      vscode.ViewColumn.Beside,
-      { enableScripts: true, retainContextWhenHidden: true }
+  if (existingPanel) {
+    return;
+  }
+  const newPanel = vscode.window.createWebviewPanel(
+    `web-panel-${url}`,
+    url,
+    vscode.ViewColumn.Two,
+    { enableScripts: true, retainContextWhenHidden: true }
+  );
+  newPanel.webview.html = fs
+    .readFileSync(
+      path.join(context.extensionPath, "dist", "panel", "index.html")
+    )
+    .toString()
+    .replace(
+      "[BASE_HREF]",
+      newPanel.webview
+        .asWebviewUri(
+          vscode.Uri.file(path.join(context.extensionPath, "dist", "panel"))
+        )
+        .toString() + "/"
     );
-    newPanel.webview.html = fs
-      .readFileSync(
-        path.join(context.extensionPath, "dist", "panel", "index.html")
-      )
-      .toString()
-      .replace(
-        "[BASE_HREF]",
-        newPanel.webview
-          .asWebviewUri(
-            vscode.Uri.file(path.join(context.extensionPath, "dist", "panel"))
-          )
-          .toString() + "/"
+  newPanel.webview.onDidReceiveMessage(
+    () => ((newPanel as any)[FLAG_ACCEPTING_MESSAGES] = true)
+  );
+  newPanel.onDidDispose(() => delete panelsByUrl[url]);
+  panelsByUrl[url] = newPanel;
+}
+
+function extractUrls(webPanelJsonFile: vscode.Uri): string[] {
+  const result: string[] = [];
+  try {
+    const fileContents = fs.readFileSync(webPanelJsonFile.fsPath);
+    const urlList = JSON.parse(fileContents.toString());
+    if (!Array.isArray(urlList)) {
+      vscode.window.showErrorMessage(
+        "Your webpanel.json file should contain a single array of URLs."
       );
-    newPanel.webview.onDidReceiveMessage(
-      () => ((newPanel as any)["accepting-messages"] = true)
+    } else {
+      result.push(...urlList);
+    }
+  } catch (e) {
+    vscode.window.showErrorMessage(
+      `Error processing webpanel.json file: ${e.message}`
     );
-    newPanel.onDidDispose(() => delete panelsByUrl[url]);
-    panelsByUrl[url] = newPanel;
-    loading.push({ url, panel: newPanel });
   }
+  return result;
 }
 
-async function loadUrls() {
-  if (!active) {
+async function monitorPanels() {
+  if (!context) {
     return;
   }
   try {
-    const toProcess = loading;
-    loading = [];
-    for (const _ of toProcess) {
-      const url = _.url;
-      const panel = _.panel;
-      const acceptingMessages = (panel as any)["accepting-messages"];
-      if (!acceptingMessages) {
-        console.log("web-panel", url, "Waiting for panel");
-        loading.push(_);
-      } else {
-        try {
-          await nodeFetch.default(url);
-          try {
-            panel.webview.postMessage({ url });
-            console.log("web-panel", url, "URL up");
-          } catch (e) {
-            console.log("web-panel", url, "Panel error", e.message);
+    for (const url of Object.getOwnPropertyNames(urls)) {
+      ensurePanel(url);
+      const panel = panelsByUrl[url];
+      if (panel) {
+        const acceptingMessages = (panel as any)[FLAG_ACCEPTING_MESSAGES];
+        const panelUp = (panel as any)[FLAG_PANEL_UP];
+        if (!panelUp) {
+          if (acceptingMessages) {
+            try {
+              await nodeFetch.default(url);
+              try {
+                panel.webview.postMessage({ url });
+                console.log("web-panel", url, "URL up");
+                (panel as any)[FLAG_PANEL_UP] = true;
+              } catch (e) {
+                console.log("web-panel", url, "Panel error", e.message);
+              }
+            } catch (e) {
+              console.log("web-panel", url, "Waiting for URL");
+            }
+          } else {
+            console.log("web-panel", url, "Waiting for panel to initialize");
           }
-        } catch (e) {
-          console.log("web-panel", url, "Waiting for URL");
-          loading.push(_);
         }
+      } else {
+        console.log("web-panel", url, "Waiting for panel to open");
       }
     }
   } finally {
-    setTimeout(loadUrls, 1000);
+    setTimeout(monitorPanels, 1000);
   }
 }
 
-function refreshWebPanelJson(file: vscode.Uri) {
-  if (!active || !context) {
-    return;
-  }
-  try {
-    const fileContents = fs.readFileSync(file.fsPath);
-    const urlList = JSON.parse(fileContents.toString());
-    if (!Array.isArray(urlList)) {
-      vscode.window.showErrorMessage(
-        "Your webpanel.json file should contain a single array of URLs."
-      );
-    } else {
-      for (const url of urlList) {
-        ensurePanel(url);
+async function parseAllUrls() {
+  const urlsToRemove = { ...urls };
+  const webPanelJsonFiles = await vscode.workspace.findFiles(PATTERN);
+  for (const webPanelJsonFile of webPanelJsonFiles) {
+    const urlsThisFile = extractUrls(webPanelJsonFile);
+    for (const url of urlsThisFile) {
+      urls[url] = true;
+      if (!!urlsToRemove[url]) {
+        delete urlsToRemove[url];
       }
     }
-  } catch (e) {
-    vscode.window.showErrorMessage(
-      `Error processing webpanel.json file: ${e.message}`
-    );
+  }
+  for (const urlToRemove of Object.getOwnPropertyNames(urlsToRemove)) {
+    delete urls[urlToRemove];
   }
 }
 
 export async function activate(extensionContext: vscode.ExtensionContext) {
   context = extensionContext;
   fileSystemWatcher?.dispose();
-  fileSystemWatcher = vscode.workspace.createFileSystemWatcher(
-    "**/.vscode/webpanel.json"
-  );
-  fileSystemWatcher.onDidChange(refreshWebPanelJson);
-  fileSystemWatcher.onDidCreate(refreshWebPanelJson);
-  active = true;
-  const runNow = await vscode.workspace.findFiles("**/.vscode/webpanel.json");
-  for (const file of runNow) {
-    refreshWebPanelJson(file);
-  }
-  loadUrls();
+  fileSystemWatcher = vscode.workspace.createFileSystemWatcher(PATTERN);
+  fileSystemWatcher.onDidChange(parseAllUrls);
+  fileSystemWatcher.onDidCreate(parseAllUrls);
+  await parseAllUrls();
+  await monitorPanels();
 }
 
 export function deactivate() {
-  active = false;
+  context = null;
   fileSystemWatcher?.dispose();
   fileSystemWatcher = null;
   for (const url of Object.getOwnPropertyNames(panelsByUrl)) {
diff --git a/src/panel/Frame.tsx b/src/panel/Frame.tsx
index 5ad985c..51e0895 100644
--- a/src/panel/Frame.tsx
+++ b/src/panel/Frame.tsx
@@ -23,7 +23,7 @@ export default function Frame() {
   return (
     <div style={{ height: "100%", display: "flex", flexDirection: "column" }}>
       {!!iframeSrc && (
-        <iframe style={{ flex: "1" }} src={iframeSrc} ref={iframe} />
+        <iframe style={{ flex: "1", border: 0 }} src={iframeSrc} ref={iframe} />
       )}
       {!iframeSrc && (
         <div