diff --git a/extension/src/ConnectionHandler.ts b/extension/src/ConnectionHandler.ts
index 3ea81e6..2db4e2e 100644
--- a/extension/src/ConnectionHandler.ts
+++ b/extension/src/ConnectionHandler.ts
@@ -72,12 +72,18 @@ export class ConnectionHandler {
 				openInBrowser: async ({}) => {
 					throwIfNotAuthenticated();
 
+					const url = server.getIndexUrl({
+						expression: this.watcher
+							? this.watcher.expression
+							: undefined,
+					});
+
 					let opened = false;
 					if (config.useChromeKioskMode()) {
-						opened = await launchChrome(server.indexUrl);
+						opened = await launchChrome(url);
 					}
 					if (!opened) {
-						open(server.indexUrl);
+						open(url);
 					}
 				},
 				setPreferredDataExtractor: async ({ dataExtractorId }) => {
diff --git a/extension/src/Server.ts b/extension/src/Server.ts
index bab4b26..d99a05e 100644
--- a/extension/src/Server.ts
+++ b/extension/src/Server.ts
@@ -28,9 +28,13 @@ export class Server {
 		});
 	}
 
-	public get indexUrl(): string {
+	public getIndexUrl(args: { expression?: string } = {}): string {
 		const port = process.env.USE_DEV_UI ? 8080 : this.port;
-		return `http://localhost:${port}/index.html?serverPort=${this.port}&serverSecret=${this.secret}`;
+		const expr =
+			args.expression !== undefined
+				? `&expression=${encodeURIComponent(args.expression)}`
+				: "";
+		return `http://localhost:${port}/index.html?serverPort=${this.port}&serverSecret=${this.secret}${expr}`;
 	}
 
 	public get mainBundleUrl(): string {
diff --git a/extension/src/WebViews.ts b/extension/src/WebViews.ts
index a1138e5..ab167c2 100644
--- a/extension/src/WebViews.ts
+++ b/extension/src/WebViews.ts
@@ -89,7 +89,7 @@ export function getHtml(server: Server) {
 				</script>
 				${
 					isDev
-						? `<iframe sandbox="allow-top-navigation allow-scripts allow-same-origin allow-popups allow-pointer-lock allow-forms" src="${server.indexUrl}"></iframe>`
+						? `<iframe sandbox="allow-top-navigation allow-scripts allow-same-origin allow-popups allow-pointer-lock allow-forms" src="${server.getIndexUrl()}"></iframe>`
 						: `<script type="text/javascript" src="${server.mainBundleUrl}"></script>`
 				}
             </body>