...seems false? At least with noscript on I can still see the site. (disclaimer: I work on the site. There's definitely reduced functionality if you don't have JS enabled, but surprised/confused if you can't see stuff at all)
No Firefox reader support, nothing on the page, effectively the cause is that TPRB blocker block forum.effectivealtruism.org + NoScript blocking lesswrong.com js but anyway, without allowing the third party domain AND the main JS I can't see anything...
