Wow...
I confirm that:
Out of memory (NS_ERROR_OUT_OF_MEMORY). My K-meleon 75.0 going up to 300MB of RAM.
As 75 branch is no more in development, you could test the 76beta3 from the announcement subforum and confirm it to report in that thread so Dorian could fix it if still happens in the future K-meleon release.
Probably just a scripting error, not fixable in K-meleon, but worth the test.
As a workaround, browse with Javascript disabled through some pages. I do most of the times, unless necessary without harm. And that page in particular, looks fine without it, except you are not able to see Disquss comments.