UPDATE: Glad it works now! The Fanboy Annoyances list is the nemesis of SSS icons, and I forgot it once again. ;)

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Hi there and thank you for the review! :)

Could you tell me what is the URL for the icon and for the search (in the SSS settings)?

On Firefox 59, I am using the default YouTube icon I include with SSS (among others) and it appears to be working normally here. Icons not showing is usually due to some difference in a configuration. If you have more details I can try to pinpoint the problem. :)

Please reply to daniel.rb.lobo+sss@gmail.com if you can, because the notifications for these reviews are unreliable!

Cheers,
Daniel