Ruby UI with Chrome. I forgot the name

Ruby
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I am looking for the name of a gem that was announced some time ago (1
or 2 month). It is a UI gem working with Chrome.
The name sounded like ‘fulmarillion’???

2
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Regis d’Aubarede wrote in post #1181117:

GitHub - zach-capalbo/flammarion: The nifty ruby gui toolkit.

Merci beaucoup.