please add 16/32px PNG favicon as described on
https://ipfs.io/ipfs/QmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco/wiki/Favicon.html

Also, we need to remember it needs to be explicit definition using absolute or a relative path, otherwise it won't work when loaded from HTTP gateway. (I already fixed that bug for ipld.io: https://github.com/ipld/website/pull/47)
It could be blue when connected and grey when disconnected 馃槃
I thought you could use a Data URL? Or maybe via Canvas, like those sites with dynamic icons?
the favicon for v2 contains the renderings at:
https://github.com/ipfs-shipyard/ipfs-webui/blob/master/public/favicon.ico
It seems to be working now. Closing this!
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It could be blue when connected and grey when disconnected 馃槃