[Bug] Audio content continues to play after tab is closed, until undo snackbar disappears

[mcomella]

Steps to reproduce

• Open audio content (e.g. pick first item on soundcloud.com)
• Open tabs tray
• Swipe to close tab

Expected behavior

Audio stops

Actual behavior

Audio continues playing until "Undo" tab removal snackbar disappears.

This issue does not affect YouTube because YouTube appears to intentionally pauses audio content when the browser window goes to the background (e.g. behind the tabs tray).

Device information

• Android device: Pixel 2
• Fenix version: 1.0.1920

┆Issue is synchronized with this Jira Task

[Eccenux]

Weird because in Firefox Preview audio stops playing as soon as I go to the tabs tray. Which is worse because I want podcasts to keep playing in background. In current Firefox for Android audio keeps playing in background even when you lock the phone, but it stops when you close the tab.

Related issue: Persistent notification when audio is playing in Fenix #2551

[mcomella]

Weird because in Firefox Preview audio stops playing as soon as I go to the tabs tray.

I notice that behavior on YouTube.com but on other sites I notice my behavior: the audio continues playing in the background, including when the app is backgrounded.

[sv-sdeiac]

Hello, I can reproduce this issue using Google Pixel (Android Q) with the latest version of Firefox Preview Nightly 1/6 build #20060605.

My steps to reproduce are:

1. Go to rockfm.ro;
2. Start the radio music;
3. Open the tab tray;
4. close the media tab;

The actual results are the same as in the description.
For more investigations, please don't hesitate to ask for them, thanks.

[AndiAJ]

Hi, verified as fixed on the latest Nightly Build #21060608 from 4/15 using the following devices:
• Google Pixel 3a (Android 10)
• Huawei Mate 20 Lite (Android 9)
• OnePlus A3 (Android 6.0.1)

► Video

✔️ The audio stops as soon as the user closes the tab.
PS. The notification is dismissed only after the confirmation disappears