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Favioli helps you stay productive in a sea of tabs by replacing blank favicons with unique per-site emoji. The extension also includes a customizable favicon override engine.

Source code is available at https://go.eligrey.com/favioli/source.

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    Does anyone have a sense of the level of effort required to port something like this to run on Firefox?

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      Porting this would make for a great starter project if you’re just getting into Firefox extension development!

      Depending on your level of experience it would take a competent developer anywhere from 1 to 4 days to complete the port.

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        Indeed, should be quite easy.