Extension does not work in Safari 16

[n0samu]

Describe the bug

Several users have reported that the Ruffle extension does not work in Safari 16. The extension popup always says "Checking Ruffle status on current tab..." and the Ruffle player does not appear on the page. Initial investigation by @kmeisthax suggests that there was some change in Safari 16 to how postMessage works, which was not mentioned in the release notes.

Expected behavior

The extension should work as it does in other browsers.

Affected platform

Browser's extension

Operating system

MacOS Monterey, Big Sur, and Ventura

Browser

Safari 16

Additional information

No response

[bootlegseahorse]

Looks like it doesn't work on Safari 17 either. I'm testing on Safari 17.3 and macOS Ventura by the way.

[danielhjacobs]

This may be fixed tonight, but none of our devs had the ability to test the PR that purportedly fixed it. Please test the new Nightly when it releases and check if it works. If not, feel free to reopen this issue.

[thy486]

Although this PR allows ruffle.js to be embedded normally.

Unfortunately, due to Safari's restrictions on expansion, we need to make relevant polyfills for webpack require.