I think this program is best for firefox

Firefox now has HTTPS redirection built-in, so this add-on is NO LONGER NECESSARY. Check your Options to enable it. The setting is at the very bottom under "Privacy & Security", called "HTTPS-Only Mode". The new browser setting does everything that this add-on does, except natively.

I want to thank the Electronic Frontier Foundation for providing this add-on for many years until it was finally supported natively! Your job here is done, but please don't give up the good fight! There are still many more battles to be won in the privacy realm. Keep up the great work.

It's a great extension and warns me when I go to HTTP sites. Recommended!

Eh, not as good as Smart HTTPS or the HTTPS features of Firefox Desktop.