test(jassub): [PKG-JASSUB-09] isolate Firefox bitmap readback stalls

playwright.jassub-diagnostic.config.js

@@ -0,0 +1,14 @@
+import base from './playwright.config.js'
+
+// Diagnostic profile only; canonical browser acceptance uses playwright.config.js.
+export default {
+  ...base,
+  testMatch: /jassub-(?:native|hybrid|platform)\.spec\.js$/,
+  projects: base.projects.filter(project => project.name === 'firefox').map(project => ({
+    ...project,
+    use: {
+      ...project.use,
+      launchOptions: { firefoxUserPrefs: { 'gfx.webrender.software': true } },
+    },
+  })),
+}