Opera used to have this ;'-( before they fired the entire Presto (browser engine) team and switched to webkit/chrome.

I've been giving the "modern" Opera a test run for the past week and while it's still way snappier by miles (compared to firefox and chrome, on a slow laptop) but it still misses so many features I used to depend on in the 2000s.

Yes you can get add-ons for almost all of the functionality, but you'll grind firefox or chrome to a halt before you even get close the the functionality of the old Opera that just came with all that stuff, batteries included.

(before accusations of bloat: installer/executable size was tiny, I seem to remember below 1MB for medium-old versions)

That one you can get with uMatrix, which gives you a table of Domain x {cookie, css, image, plugin, script, XHR, frame, other}. You can use this table to selectively decide what gets loaded, and what gets blocked. The default rules are, everything "first-party" (from the domain you're visiting) is allowed, but only images and CSS are allowed from any other sources. Beyond per-primary-domain overrides, you can also whitelist all or some of the content permanently in settings.

I've been using it for the past year or so, and while occasionally annoying, it makes the Web a saner place to visit, and it also makes it very obvious just how much useless crap people make you download to display their site.

EDIT: also, favouriting your comment for future reference. Maybe one day I get pissed enough and write the plugin you describe.