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Firefox will upgrade page loads to HTTPS and gracefully fall back to HTTP if that does not succeed. This behavior is known as HTTPS-First.
Wasn’t this already the case? For a while?! I don’t know whether this means HTTPS sites will load more reliably, or HTTP sites will.
One potential workaround, if you’re okay with using extra software, is making a script with AutoHotKey to intercept Ctrl+Alt+X and fire a different key combo in its stead.
This doesn’t fix the issue with the Firefox but, you know, it’s something.