[Intermittent] After the "Play" command the Spotify tab remains active even if it starts playing

[alexandra-martin]

Prerequisites:

Mic permissions are enabled.

STR:

1. Use the shortcut or click on the mic icon from the browser toolbar.
2. Say or write a "Play" command, e.g. "Play Green Day".

Expected result:

While in the active tab, a new Spotify tab is opened, becomes active and starts playing, then the previous tab becomes active again with the Spotify playing in the background.

Actual result:

After the Spotify tab starts playing, it remains active and it doesn't switches back to the previous tab.

Notes:

Reproduced on Mac 10.14.6 and Win10x64 with Firefox Nightly 71.0a1 (64-bit). Reproduced intermittently on both Mac and Win. On Win I managed to reproduce it 5/10 times but also 8/10 or 10/10 times. On Mac I managed to reproduce it 5/10 times, but also 6/10 or 7/10 times. Also the following behaviours were observed after performing the above steps:

• the "Doorhanger" displays the instructions to allow autoplay, even if the tab already has autoplay enabled and the music is playing, like in 380.
• very rarely (2 out of more than 30 times on Win, not encountered yet on Mac) the Spotify tab will not play even if the tab is active and the autoplay is turned on (second gif).

[ianb]

I think this is a timing issue – we give the tab a certain amount of time to start playing, and sometimes it just takes too long. Probably the Windows machine is just slightly slower ;)