address bar defaults to https
I cannot stop Firefox from adding https to address bar. I type in http, and it changes to https, Even if I set my homepage with an http only address, it automatically goes to https
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Does this affect all sites?
There certainly are some sites that instruct Firefox to use HTTPS only (HTTP Strict Transport Security or HSTS), and in fact Firefox includes a list of such sites provided by Google. Firefox will always want to use HTTPS with such sites. Is there a problem using HTTPS with popular sites?
The HTTPS Everywhere extension can force HTTPS connections. Probably you would know if you have this add-on.
There is an experimental feature in Firefox to force HTTPS, but that shouldn't be turned on automatically. You can check here:
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.
(2) In the search box in the page, type or paste https_only and pause while the list is filtered
(3) If the dom.security.https_only_mode preference is bolded and has a value of true, double-click it to restore the default value of false
More info on about:config: Configuration Editor for Firefox.
Note that you should also see this setting at the bottom of "Options/Preferences -> Privacy & Security -> HTTPS-Only Mode".