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How to reach a site used in the past, but now, can't reach?

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How to reach a site used in the past (whether typed URL or used saved Bookmark!) ---but now Firefox won't let me access now, please?! I have some sites for decorating my online gaming site. Your settings warn me that the site isn't ---https://. --- which I realize, and FIREFOX stops me from going to the site. How do I temporarily use a site, then restore the security? I appreciate how FIREFOX keeps us safe! TY!

How to reach a site used in the past (whether typed URL or used saved Bookmark!) ---but now Firefox won't let me access now, please?! I have some sites for decorating my online gaming site. Your settings warn me that the site isn't ---https://. --- which I realize, and FIREFOX stops me from going to the site. How do I temporarily use a site, then restore the security? I appreciate how FIREFOX keeps us safe! TY!

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Which error page do you get?

The one for the "HTTPS ONLY" feature should let you bypass the rule. If necessary, you can turn off HTTPS ONLY on the Settings/Preferences page. See: HTTPS-Only Mode in Firefox.

The one that says Firefox didn't connect because the server doesn't have a valid certificate typically has an Advanced button that lets you bypass the error. If you can't bypass, could you copy/paste the error message from the page into a reply (in this thread, the forum doesn't accept replies by email).

If it's some other page, what does it say?