SUMO favicon not displayed on Firefox for Android

[escattone]

https://bugzilla.mozilla.org/show_bug.cgi?id=2020375

[emilghittasv]

I can confirm that this issue is verified fixed.

[emilghittasv]

@escattone Unfortunately prod is still affected by this issue on Firefox for Android.

Note: stage is not affected.

I am going to re-open this ticket and move it inside the in progress column for the current sprint to investigate.