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[BUG] Playwright refuses to load some pages via proxy in Firefox

See original GitHub issue

Context:

System:

OS: macOS 12.0.1
Memory: 7.83 GB / 64.00 GB

Binaries:

Node: 16.11.1 - ~/.asdf/installs/nodejs/16.11.1/bin/node
Yarn: 1.22.17 - /usr/local/bin/yarn
npm: 8.0.0 - ~/.asdf/plugins/nodejs/shims/npm

Languages:

Bash: 3.2.57 - /bin/bash

npmPackages:

playwright: ^1.16.3 => 1.16.3

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:


const { chromium, webkit, firefox } = require("playwright");

(async function () {
  const browser = await firefox.launch({
    headless: false,
    ignoreHTTPSErrors: true,
    proxy: {
      server: "$SERVER",
      username: "$UN",
      password: "$PWD",
    },
  });

  const page = await browser.newPage();

  let response = await page.goto(
    "https://www.github.com"
  );
})();

Describe the bug

For some pages using the Firefox engine, Playwright will not load them at all when given a proxy – it’ll just spin until it gets a timeout error. For example, https://www.github.com: http://recordit.co/cXjdMkOG1X

Other pages work just fine. For example, Reddit: https://recordit.co/WFKZB0b0sG

The Chromium engine does not have this problem, and I have tried multiple HTTP proxies, so it’s not an issue with the specific proxy or the site. Playwright loads sites just fine without the proxy.

(I’m using https://brightdata.com proxies, if you’d like to test this on your own).