I'm going to assume it's not Universal Blue... But parts of your description reminded me of it.
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Could've been something Fedora-ish but based on the GitHub I don't think that's it. The most distinct thing I remember is that it appeared abandoned but the author just didn't feel it needed any changes.
I use like four different devices to browse and some have multiple browsers so checking history has been rough.
I don't suppose you're thinking of the system BlendOS uses, right? It's the closest I can think of based on your description but it doesn't seem to fit the timeframe.
Are you maybe thinking of https://distr1.org/ made by the i3 guy?
Interesting but not what I was thinking of. I think in the GitHub also the author gave a specific example of an OS layered with the Steam client.