I work with at least 10-15 tabs open at a time, which means I have to pin some of them and then can ONLY see the favicon. When tabs for support, help center, chat, talk, and connect are open and pinned, 3 of the 5 tabs (support, chat, & talk) look exactly alike. I wanted to have the ability to choose separate favicons for each of those 3 and also Connect so I can pin them all and then get to them quickly. The screenshot below shows you what the problem looks like.
I just did a little searching on the interwebs and found a work-around! If you use Chome, you can install an extension called Bookmark Favicon Changer. It allows you to choose exactly what each icon will be displayed for your bookmarks (and it will also display in your tabs when the page is a full or pinned tab!!)
Step 1: Install theBookmark Favicon Changer extension here: https://chrome.google.com/webstore/detail/bookmark-favicon-changer/acmfnomgphggonodopogfbmkneepfgnh?hl=en-US
Step 2: Download the favicons you need straight from the mothership here: http://garden.zendesk.com/favicons
Step 3: Bookmark the various Zendesk sites you want to fix.
Step 4: Right click on the Bookmark Favicon Changer icon in the browser and choose "options"
Step 5: Find your bookmark, right click, change favicon, navigate to wherever you saved your favicons.
And poof! Here's the 'after' shot of the same tabs you saw above. Now it's all color-coded and super easy to see where I'm going at a glance!!