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It's already in the Firefox version. (At least, I have HTTPS Everywhere 5.0.1 and there is a "Block all HTTP requests" menu option.)

There would have to be an exception for *.onion addresses in TBB, as they are already end-to-end encrypted over HTTP.

If you're having a hard time finding the "Turn on HTTP Nowhere" option:

In a normal tab, left click the HTTPS Everywhere icon in the top right of the browser and click the "Turn on HTTP Nowhere" checkbox.

Annoyingly, this results in an error rather than an attempt to redirect to the https version of the same site.

HTTP Nowhere has an option to redirect.

Where? At least in the Chrome version, all you get is the single button settings UI, and there's no redirect option. Toggling the experimental rules has no effect.

Second this, great feature. I've been waiting for a fork of Chromium or Firefox that will refuse to load http links, although in retrospect an extension would work better for that anyway.