[BUG] Firefox tests crash with "Unexpected number of tabs in the new window"

[gcatto]

Context:

• Playwright Version: 1.13.1
• Operating System: Windows
• Node.js version: v12.22.4
• Browser: Firefox
• Extra: N/A

Code Snippet

Help us help you! Put down a short code snippet that illustrates your bug and
that we can run and debug locally. For example:

C:\dev>npx playwright ff google.com
[open: Protocol error (Browser.newPage): Unexpected number of tabs in the new window: 2 newPage@chrome://juggler/content/TargetRegistry.js:321:13

] {
  name: 'Error'
}

Describe the bug

Trying to run tests, even just using the npx playwright ff google.com command as per above, crashes in Firefox immediately. When I run not in headless, I can see the extra Firefox privacy tab:

[aslushnikov]

@gcatto interesting! Do you have any enterprise policies installed on your machine? I just ran the same thing and it works perfectly fine for me.

[gcatto]

@aslushnikov ah yes, this is on an enterprise machine with enterprise policies and enterprise firefox. Just learning my way around Playwright so far, not yet clear to me how Playwright interacts with installed browsers and such.

[gcatto]

@aslushnikov any further thoughts or guidance on this front? Not really sure where/how to start tackling it. Thanks!

[mxschmitt]

I'm able to reproduce:

I had a broken installation.

[mxschmitt]

@gcatto could you try if its still reproducible with npx playwright@next ff google.com?