Why aren’t site-specific HTTPS bypass procedures for Firefox as described in another Super User thread not working?

I’m running Firefox 144.0 under Linux (Debian 13).

I have carefully read everything in the following superuser post concerning the bypassing of HTTPS in Firefox:

• Firefox allow HTTP URLs (and not force HTTPS)

…and none of those Super User-listed procedures for site-specfic bypassing of forced HTTPS are working for me.

Per the discussion in that Super User post, I did each and every one of the following things:

1. I set network.stricttransportsecurity.preloadlist to false in about:config
2. I set browser.fixup.fallback-to-https to false in about:config
3. I set browser.urlbar.autoFill to false in about:config
4. I set browser.fixup.alternate.protocol to http in about:config
5. In Firefox Settings, I specifically specified the URLs that I only want to access via HTTP in the Exceptions - HTTPS-Only Mode section to be set to off.

And I restarted Firefox after each of these changes and verified that these changed values still remained in about:config and in Firefox Settings after each restart… And all of my changes did indeed remain.

However, after all of this, each of the URLs that I set up to be accessed via HTTP was still forced by Firefox to be accessed only via HTTPS.

Is this inability to prevent HTTPS access some sort of “enhancement” (ha ha!) that the Mozilla people have started shoving down the throats of all Firefox users nowadays?

Or perhaps are there other ways (other than the 5 things I listed above) for allowing certain sites to always be accessed via HTTP in Firefox?

I hope it’s the later.