Switch to firefox for testing

.gitignore

@@ -115,3 +115,6 @@ junit.xml
 [uU]ntitled*
 jupyterlab_classic/static
 jupyterlab_classic/labextension
+
+# playwright
+app/artifacts/videos

app/test/smoke.spec.ts

@@ -1,4 +1,4 @@
-import { chromium, Browser, BrowserContext } from 'playwright';
+import { firefox, Browser, BrowserContext } from 'playwright';
 
 describe('Smoke', () => {
   let browser: Browser;
@@ -6,7 +6,7 @@ describe('Smoke', () => {
 
   beforeAll(async () => {
     jest.setTimeout(200000);
-    browser = await chromium.launch({ slowMo: 1000 });
+    browser = await firefox.launch({ slowMo: 1000 });
     context = await browser.newContext({
       recordVideo: { dir: 'artifacts/videos/' }
     });