Firefox HMR error in console

[wesbos]

This isn't breaking anything, but on every single page load, I get this error with either versions of hot reloading turned on:

The connection to http://localhost:8000/__webpack_hmr was interrupted while the page was loading

Followed by [HMR] Connected.

This is in Firefox only and I had the exact same issue in Next.js, which was fixed here:

vercel/next.js#9776

It seems like the fix was adding this:

    window.addEventListener('beforeunload', () => {
      closePing()
    })

https://github.com/zeit/next.js/pull/9798/files

Steps to reproduce

1. Clone a website - like gatsby starter.
2. Open in Firefox (I'm using developer edition)
3. View the console error

Environment

System:
OS: macOS 10.15.2
CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 13.9.0 - /usr/local/bin/node
Yarn: 1.22.0 - /usr/local/bin/yarn
npm: 6.13.7 - /usr/local/bin/npm
Languages:
Python: 2.7.15 - /usr/local/bin/python
Browsers:
Chrome: 81.0.4044.129
Firefox: 59.0.1
Safari: 13.0.4
npmGlobalPackages:
gatsby: 2.15.14

[pieh]

Thanks for pointer to Next.js fix, but closePing() is using some of Next.js internals that make use of EventSource. We likely do need similar fix, but we don't use EventSource directly, so this is hidden somewhere in our dependencies. So from initial evaluation this might need fix somewhere upstream - we just need to figure out where :)

[github-actions]

Hiya!

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[github-actions]

Hey again!

It’s been 30 days since anything happened on this issue, so our friendly neighborhood robot (that’s me!) is going to close it.
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As a friendly reminder: the best way to see this issue, or any other, fixed is to open a Pull Request. Check out gatsby.dev/contribute for more information about opening PRs, triaging issues, and contributing!

Thanks again for being part of the Gatsby community! 💪💜