I haven't heard of alternative webbrowsers.
I tried to run headless chrome -> screenshot -> display screenshot (for webapp that don't require interaction like a weather display) but didn't get anywhere with it either.
Kobo still runs on ancient 2.x kernel and recent apps refuse to cooperate with that anymore (modern glibc says kernel too old! and quits).
There are transpilers for JavaScript that make modern JavaScript work in old browsers, maybe try that first...
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