[alpaca128]

The line length even seems to be limited already, just at a (too) high number. WHen I maximize the browser window the comment texts use about 2/3 of the width.

I just tried and Firefox' reader mode automatically limits the width, though unfortunately that's not made for interactive use. I guess it might be a good idea for a browser plugin (if it doesn't already exist), similar to the ones forcing dark color themes on websites using CSS.