The icon you normally see up in the tab is the "favicon" - simply a file at the root level called "favicon.ico" usually - that your browser knows to fetch.

Some sites do not have one. If you run a webserver with streaming logs, and point chrome to it - you'll see requests for this favicon 404.

This extension replaces missing favicons with emoji for easier visual scanning

I haven't used it yet, but from the looks of it the icons are customizable too. If you don't like the favicon for a certain site you can overwrite it. Could be good for a few blogs that I read that haven't bothered changing the default wordpress favicon.

I didnt get those are custom emojis. Iv been browsing with >50-100 tabs open for at least 10 years and websites with broken/no favicon are very rare. Its usually servers you expect to be permanently broken, like https://blogs.msdn.microsoft.com/favicon.ico

Second paragraph of the article:

> The practical inspiration for Favioli came from my day job. We have a lot of internal tools and sites, and they tend to either not have favicons, or have the standard Sony logo. For me this was a bit of a pain, because I love to pin my tabs. I couldn’t tell these sites apart.

>internal tools and sites

why not fix internal servers?

Fix someone else's server? It doesn't work like that.

_internal_ usually implies inside your own company

You either don't understand the point or you're being obtuse. It exists because of the problem that you're suggesting is somehow a solution. Good luck getting everyone to change their favicons to your liking.