favicon

small icon often found to the left of the URL in the address bar of a web browser.

I often forget the name of a site but can usually id which one I want by the favicon in my favorites list.

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favicon wall

The point at which the number of tabs open in your browser results in the small tab icon (favicon) disappearing.

As in: 'hitting the favicon wall'

The result being that you are no longer able to identify which tab is which, and must therefore either go though them one by one, or start closing tabs in order to (once again) see each tab's favicon, so that you can easily identify the content of each tab.

- "Damn, I just opened my 30th tab and hit the favicon wall. Now i don't know which tab has that funny Reddit pic."