Question

It seems that there are two different favicons used in FB. The Kiwi is the primary favicon used almost everywhere in FB, but I noticed that when FB opens image attachments in a new tab that the tab gets the fogcreek favicon . Is this intentional? It would make sense to me for FB use one favicon application wide so that I can easily identify my FB tabs.

Answer 1

Short answer: Having two different icons is intentional, but seeing one in most places and the other for attachments is not.

Longer, more technical answer: The kiwi icon is used for the FogBugz product, but now that we have an additional product that is closely integrated with FogBugz (Kiln) there are certain pages that apply to both products (administration pages and such). Because of this, we have two different icons: the kiwi for fogbugz-specific pages and the Fog Creek "wave" icon for mutli-application or "platform" pages.

Why do you see one icon for most FogBugz pages, but another for attachment tabs? That has to do with the way favicons are implemented. Basically, when we load an HTML page inside of FogBugz we can send down special tags to the browser that specify which icon to use (usually the Kiwi). For attachments, we can't do this because all that is being sent to the browser is the attachment itself. Because of this, the browser looks for the default favicon, which in our case is the Fog Creek "wave" icon.

For more information on how the two different icons came about, please read over the answer to this somewhat-related question.