exposeFunction fails with Firefox

Steps to reproduce

Tell us about your environment:

• Puppeteer version: 4.0.1
• Platform / OS version: Mac OSX Catalina 10.15.1
• URLs (if applicable): n/a
• Node.js version: 14.4.0

What steps will reproduce the problem?

Please include code that reproduces the issue.

Run the following script:

const puppeteer = require('puppeteer');

const firefoxOptions = {
  product: 'firefox',
  headless: false,
  extraPrefsFirefox: {},
  dumpio: true,
};

const browser = await puppeteer.launch(firefoxOptions);

const page = await browser.newPage();
await page.goto('https://news.ycombinator.com/');

await page.exposeFunction('test', () => {
  console.log('works!!!!');
});

What is the expected result?

Should work.

What happens instead?

Fails:

1593203097312	RemoteAgent	ERROR	UnknownMethodError: Runtime.addBinding:
	RemoteAgentError@chrome://remote/content/Error.jsm:25:5
	UnknownMethodError@chrome://remote/content/Error.jsm:108:7
	execute@chrome://remote/content/domains/DomainCache.jsm:96:13
	receiveMessage@chrome://remote/content/sessions/ContentProcessSession.jsm:86:45
caused by: 
(node:5070) UnhandledPromiseRejectionWarning: Error: Protocol error (Runtime.addBinding): Runtime.addBinding RemoteAgentError@chrome://remote/content/Error.jsm:25:5
UnknownMethodError@chrome://remote/content/Error.jsm:108:7
execute@chrome://remote/content/domains/DomainCache.jsm:96:13
receiveMessage@chrome://remote/content/sessions/ContentProcessSession.jsm:86:45

    at ~/node_modules/puppeteer/lib/Connection.js:156:63
    at new Promise (<anonymous>)
    at CDPSession.send (~/puppeteer/lib/Connection.js:155:16)
    at Page.exposeFunction (~/node_modules/puppeteer/lib/Page.js:391:28)
    at Page.<anonymous> (~/node_modules/puppeteer/lib/helper.js:117:27)
    at ~/test.cjs:37:14
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:5070) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:5070) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

[0xba1a]

+1

[sublimator]

Any update on this ? This worked on puppeteer-firefox iirc Doesn’t work now? Works on playwright