The captcha does not require JavaScript. There is a version that uses JavaScript and a version that does not use JavaScript. The latter loads as long as your browser behaves like one that doesn't support JavaScript. LibreJS doesn't do this; instead it tends to both prevent scripts from running and prevent scriptless fallbacks from working, which is why the result is often broken.

I have not actually tried posting on 4chan, but I've seen that captcha system it uses elsewhere before (on those websites where Cloudflare has blocked access from a Tor node) and gotten past it just fine without enabling JavaScript.

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