foreground onMessage not triggered on Chrome Extension popup.html

[rockmandash]

[REQUIRED] Describe your environment

• Operating System version: macOS 12.0.1
• Browser version: Chrome 96
• Firebase SDK version: 9.6.1
• Firebase Product: cloud messaging

[REQUIRED] Describe the problem

These lines ignore all chrome extension, however, popup.html doesn't fit this situation.

It would be great to add something like this: client.url.startsWith('chrome-extension://') && client.url.includes('popup.html')

firebase-js-sdk/packages/messaging/src/listeners/sw-listeners.ts

Lines 214 to 222 in 3d8109c

	function hasVisibleClients(clientList: WindowClient[]): boolean {
	return clientList.some(
	client =>
	client.visibilityState === 'visible' &&
	// Ignore chrome-extension clients as that matches the background pages of extensions, which
	// are always considered visible for some reason.
	!client.url.startsWith('chrome-extension://')
	);
	}

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.