Alternatively: Implementing analogous features as part of the Firefox core that doesn't require the addition of third-party add-ons would be even better. Sort of how Firefox has had a popup blocker for ages?
This is a Firefox product decision, probably a wontfix but up to dcamp or someone to make
HTTPS Everywhere can be replaced by solid HSTS + preloading. Features offered by, e.g. NoScript and RequestPolicy ought to be a core feature. Feel free to reinvent the wheel here, I just think users should have more power over what third parties can do to their browser (and, consequently, their computer). Something /like/ uBlock Origin ought to be bundled with Firefox, even if it's not that particular addon.