UnknownMethodError Page.setInterceptFileChooserDialog

Steps to reproduce

Just tried puppeteer for the first time, with Firefox and got this error…

Tell us about your environment:

• Puppeteer version: 2.1.0
• Platform / OS version: Windows 10
• Node.js version: v12.9.1
• Firefox Version: 72.0.2 (64-bits)

What steps will reproduce the problem?

process.env.DEBUG = "puppeteer:protocol";

const puppeteer = require('puppeteer');

(async function main(){
  
  const browser = await puppeteer.launch({
    product: "firefox",
    executablePath: "C:\\Program Files\\Mozilla Firefox\\firefox.exe"
  });

  try {
    await browser.newPage();
  } catch (err) {
    console.error('Error while opening page', err);
  }

  await browser.close();
})()

What happens instead?

Got an error.

C:\dev\node-v12.9.1-win-x64\node.exe --inspect-brk=30808 test.js 
Debugger listening on ws://127.0.0.1:30808/29af9084-6348-471f-a963-af4272a75801

For help, see: https://nodejs.org/en/docs/inspector

Debugger attached.

2020-01-28T22:29:43.970Z puppeteer:protocol SEND ► {"method":"Target.setDiscoverTargets","params":{"discover":true},"id":1}
2020-01-28T22:29:43.976Z puppeteer:protocol ◀ RECV {"method":"Target.targetCreated","params":{"targetInfo":{"browserContextId":null,"targetId":10,"type":"page","url":"about:blank"}}}
2020-01-28T22:29:43.978Z puppeteer:protocol ◀ RECV {"method":"Target.targetCreated","params":{"targetInfo":{"targetId":"8b3bcb2a-7238-437a-bbdf-8bf45efb96a3","type":"browser"}}}
2020-01-28T22:29:43.979Z puppeteer:protocol ◀ RECV {"id":1}
2020-01-28T22:29:43.980Z puppeteer:protocol SEND ► {"method":"Target.createTarget","params":{"url":"about:blank"},"id":2}
2020-01-28T22:29:43.989Z puppeteer:protocol ◀ RECV {"method":"Target.targetCreated","params":{"targetInfo":{"browserContextId":null,"targetId":12,"type":"page","url":"about:blank"}}}
2020-01-28T22:29:44.007Z puppeteer:protocol ◀ RECV {"id":2,"result":{"targetId":12}}
2020-01-28T22:29:44.011Z puppeteer:protocol SEND ► {"method":"Target.attachToTarget","params":{"targetId":12,"flatten":true},"id":3}
2020-01-28T22:29:44.026Z puppeteer:protocol ◀ RECV {"method":"Target.attachedToTarget","params":{"targetInfo":{"type":"page"},"sessionId":1}}
2020-01-28T22:29:44.027Z puppeteer:protocol ◀ RECV {"id":3,"result":{"sessionId":1}}
2020-01-28T22:29:44.029Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Page.enable","params":{},"id":4}
2020-01-28T22:29:44.029Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Page.getFrameTree","params":{},"id":5}
2020-01-28T22:29:44.030Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Target.setAutoAttach","params":{"autoAttach":true,"waitForDebuggerOnStart":false,"flatten":true},"id":6}
2020-01-28T22:29:44.031Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Performance.enable","params":{},"id":7}
2020-01-28T22:29:44.031Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Log.enable","params":{},"id":8}
2020-01-28T22:29:44.032Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Page.setInterceptFileChooserDialog","params":{"enabled":true},"id":9}
2020-01-28T22:29:44.033Z puppeteer:protocol ◀ RECV {"sessionId":1,"id":6}
2020-01-28T22:29:44.036Z puppeteer:protocol ◀ RECV {"sessionId":1,"id":4}
2020-01-28T22:29:44.036Z puppeteer:protocol ◀ RECV {"sessionId":1,"id":5,"result":{"frameTree":{"frame":{"id":25,"url":"about:blank","loaderId":null,"securityOrigin":null,"mimeType":null},"childFrames":[]}}}
2020-01-28T22:29:44.038Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Page.setLifecycleEventsEnabled","params":{"enabled":true},"id":10}
2020-01-28T22:29:44.038Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Runtime.enable","params":{},"id":11}
2020-01-28T22:29:44.039Z puppeteer:protocol SEND ► {"sessionId":1,"method":"Network.enable","params":{},"id":12}
2020-01-28T22:29:44.040Z puppeteer:protocol ◀ RECV {"sessionId":1,"id":7}
2020-01-28T22:29:44.045Z puppeteer:protocol ◀ RECV {"sessionId":1,"id":12}
2020-01-28T22:29:44.046Z puppeteer:protocol ◀ RECV {"sessionId":1,"id":8}
2020-01-28T22:29:44.046Z puppeteer:protocol ◀ RECV {"id":9,"sessionId":1,"error":{"message":"Page.setInterceptFileChooserDialog","data":"RemoteAgentError@chrome://remote/content/Error.jsm:25:5\nUnknownMethodError@chrome://remote/content/Error.jsm:108:7\nexecute@chrome://remote/content/domains/Domains.jsm:96:13\nreceiveMessage@chrome://remote/content/sessions/ContentProcessSession.jsm:69:45\n"}}
2020-01-28T22:29:44.046Z puppeteer:protocol ◀ RECV {"sessionId":1,"id":10}

null: Error while opening page
null: Error: Protocol error (Page.setInterceptFileChooserDialog): Page.setInterceptFileChooserDialog RemoteAgentError@chrome://remote/content/Error.jsm:25:5

[mikhasd]

It looks like you’re using Firefox 72. The experimental support for Firefox works best with Firefox Nightly (currently 74).

cc @mjzffr who’s the expert here

I haven’t found any indication of what FF version should be used. But that should be the root cause.

[mjzffr]

It looks like you’re using Firefox 72. The experimental support for Firefox works best with Firefox Nightly (currently 74). cc @mjzffr who’s the expert here

I haven’t found any indication of what FF version should be used. But that should be the root cause.

Yes, that error should go away if you use Firefox Nightly (74).