[chrismorgan]

It doesn’t break anywhere near as much as you may imagine. Nothing like “vast majority”. It’s a significant minority of the sort of sites that get posted here, but much smaller still in general.

But why do I do it by default? It makes the web better. Things load faster, memory usage reduces, annoyances don’t load… most of what you miss out on is actually better gone. Privacy and tracking stuff is actually more a convenient benefit than the main purpose, to me.

Similar deal with disabling font selection (Firefox: Settings → Fonts → Advanced… → untick Allow pages to choose their own fonts, instead of your selections above). Rarely it actually breaks things (three times in six years, all last year), and that misbegotten nonsense which is Material Icons makes occasional things ugly if you also block web fonts altogether e.g. in uBlock Origin (by default, Firefox whitelists some icon fonts for this reason—see pref browser.display.use_document_fonts.icon_font_allowlist), but using your own chosen fonts only really does make things better.

Like sibling commenter, I use uMatrix to block this. Also I don’t have it enabled in Private Browsing windows, so they get JS, which I find a handy way of managing it.