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.
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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.
I'm going to assume it's not Universal Blue... But parts of your description reminded me of it.
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.