URL: https://messenger.com

Browser / Version: Firefox 60.0
Operating System: Mac OS X 10.13
Tested Another Browser: Yes

Problem type: Video or audio doesn't play
Description: Audio recordings from Android won't play in Firefox on messenger.com
Steps to Reproduce:
Recorded audio on my Android phone and tried to share with myself over Facebook Messenger.

Using Android 7.1.1:

1. Record some audio using the Audio Recorder app on Android
2. Click the Recordings tab in the app
3. Tap the menu button for your recording (3 little dots)
4. Tap Share then share using Facebook Messenger app
5. Find your profile and press send (to send to yourself)

On Firefox 60 for OSX:

6. Navigate to https://messenger.com and sign in
7. You should see the recording you sent yourself
8. Press play

Expected result:
Audio plays

Actual result:
Get a spinner and the audio doesn't play

Works as expected in Chrome.

Console messages:

Media resource https://cdn.fbsbx.com/v/{{CUT FOR PRIVACY}} could not be decoded.

Media resource https://cdn.fbsbx.com/v/{{CUT FOR PRIVACY}} could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006)
Details: static MP4Metadata::ResultAndByteBuffer mozilla::MP4Metadata::Metadata(mozilla::ByteStream *): Cannot parse metadata

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