redirection - When I enter an address with https, Firefox (sometimes) changes it to http

What I did:

1. I visited https://en.wikipedia.org./wiki/Main_Page (yes, there is a dot after TLD)


2. I got an SSL error (because the cert isn't valid for the domain name with dot)


3. I visited http://en.wikipedia.org./wiki/Main_Page (not https)


4. I opened a new tab and entered https://en.wikipedia.org./wiki/Main_Page again


5. Now Firefox transforms this URL and changes https to http

I don't think that it's a redirect initiated by the site, because:

• it immediately changes the URL after hitting enter, even before the connection to the site is established


• when I enter the URL in a different browser, it works

I noticed it with URLs that produced an SSL error. Maybe some kind of caching to prevent that users see SSL errors again? How could I deactivate this without disabling/cleaning the whole cache?

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EDIT: Svend Hansen seems to notice the same problem, but his fix was to disable the whole URL bar autocomplete.