The reason you see a blank page is because the website wraps content into a <noscript> tag and by "disabling javascript" it wants you to render <noscript> content, not actually disable javascript. But it's a bad idea in practice. Most websites work better out of the box if you disable javascript, but not render <noscript>, and also disable CSS, and inject some custom style to fix size of embedded icons. I'm not sure if there is a public extension that does that though.
I really don't think that's true. For one thing, anything beyond static content sites are just not going to work. And even content sites could well be unusable without their layout CSS. I really don't see the point in subjecting oneself to such hassle.
I would suggest that most websites work better if you have javascript and CSS enabled, since that's what they were designed for, but use an ad blocker like uBlock matrix to remove the ads.
