Do you recall which browser?

BrowseX, written mostly in Tcl/Tk, was included in one microdistro. Probably LNX-BBC, per Wikipedia.

<https://wiki.tcl-lang.org/page/BrowseX>

<https://en.wikipedia.org/wiki/Bootable_business_card#Operati...>

And a Javascript capable HTML4 browser, and a decent-looking and performant GUI desktop too.

It's a shame QNX (desktop) died, used to be way more performant and stable compared to Linux or anything else back in the day.