Are you using WiFi? One possible reason for a router to intercept your attempted connections is to require you to authenticate, although you normally would only see that as a guest, such as a coffee shop customer or at the airport. As a test, try loading a non-secure address by using http:// explicitly. For example:

http://example.com

Do you get any messages from the router when you use http rather than https?

As a note, when you sign into your router to manage it, you probably need to use the Advanced button to create an exception because it is a self-signed certificate.

Why are you not using Firefox site to download the latest FF version and instead using Chrome? This is probably where the problem is coming form. Firefox has their own site to download the lastest FF. I think first you need to get FF from Firefox site and try again. And make sure your Router itself is working and has lastest firmware.

https://archive.mozilla.org/pub/firefox/releases/

Scroll to latest and click the correct 32 or 64 version and then check to get the right language version to install.

Why are you not using Firefox site to download the latest FF version and instead using Chrome? This is probably where the problem is coming form. Firefox has their own site to download the lastest FF. I think first you need to get FF from Firefox site and try again. And make sure your Router itself is working and has lastest firmware. https://archive.mozilla.org/pub/firefox/releases/ Scroll to latest and click the correct 32 or 64 version and then check to get the right language version to install.

When I said I used chrome, I meant I used chrome browser to navigate to the Firefox site download the installer. I did this because I cannot get to any firefox website related pages through the firefox browser as I mentioned in my question. You can't even get the firefox installer form the chrome website

Are you using WiFi? One possible reason for a router to intercept your attempted connections is to require you to authenticate, although you normally would only see that as a guest, such as a coffee shop customer or at the airport. As a test, try loading a non-secure address by using http:// explicitly. For example: http://example.com Do you get any messages from the router when you use http rather than https? As a note, when you sign into your router to manage it, you probably need to use the Advanced button to create an exception because it is a self-signed certificate.

I am on wifi although it is my home private network. http vs https made no difference, I get the same error message. There is no advanced option when I log in to my router. Did you meant advanced in router settings?

Sorry about that. "markwarner22" doesn't seem to have understood the scenario. Let me know what happens with http:// addresses.

Sorry about that. "markwarner22" doesn't seem to have understood the scenario. Let me know what happens with http:// addresses.

Same error with http addresses.

jscher2000 - Support Volunteer said

Sorry about that. "markwarner22" doesn't seem to have understood the scenario. Let me know what happens with http:// addresses.

Same error with http addresses.

I guess either Firefox, your router, or an add-on is redirecting to https, because you can't get a secure connection error for an http:// address like http://example.com/.

Is your browsing in Chrome proxied by your router? You could check the certificate for a secure site you're visiting to make sure you are connecting directly and not being filtered by your router.

Vipul Sharma said

jscher2000 - Support Volunteer said

Sorry about that. "markwarner22" doesn't seem to have understood the scenario. Let me know what happens with http:// addresses.

Same error with http addresses.

I guess either Firefox, your router, or an add-on is redirecting to https, because you can't get a secure connection error for an http:// address like http://example.com/.

Is your browsing in Chrome proxied by your router? You could check the certificate for a secure site you're visiting to make sure you are connecting directly and not being filtered by your router.

How do I check in the certificate whether its proxied by my router?

In Chrome or Edge, I think you can check the certificate by clicking the lock icon in the address bar on the page. Google sites are generally verified with Google certs. For this site, I'm currently seeing a "Let's Encrypt" cert.

In Chrome or Edge, I think you can check the certificate by clicking the lock icon in the address bar on the page. Google sites are generally verified with Google certs. For this site, I'm currently seeing a "Let's Encrypt" cert.

Thats what I see as well. For reddit I see digicert

Okay, I still think it's some kind of authentication screen, but you need to hit an http:// address that doesn't redirect to https:// in order to get that screen.

How about this link:

http://forums.mozillazine.org/

(The site doesn't redirect to https://)

Okay, I still think it's some kind of authentication screen, but you need to hit an http:// address that doesn't redirect to https:// in order to get that screen. How about this link: http://forums.mozillazine.org/ (The site doesn't redirect to https://)

This link works.

It went straight through? Hmm, I'm puzzled why the router is blocking connections selectively.

If you create an exception for http://example.com/ (click the Advanced button on the error page, then add an exception), does it go straight to the site or does the router show any messages?

It went straight through? Hmm, I'm puzzled why the router is blocking connections selectively. If you create an exception for http://example.com/ (click the Advanced button on the error page, then add an exception), does it go straight to the site or does the router show any messages?

Do you want me to go to https or http? The latter does not result in an error page

jscher2000 - Support Volunteer said

It went straight through? Hmm, I'm puzzled why the router is blocking connections selectively. If you create an exception for http://example.com/ (click the Advanced button on the error page, then add an exception), does it go straight to the site or does the router show any messages?

Do you want me to go to https or http? The latter does not result in an error page

So under DNS over HTTPS setting in the setting menu I switched to Max Protection and that seemed to have fixed everything.

Vipul Sharma said

jscher2000 - Support Volunteer said

It went straight through? Hmm, I'm puzzled why the router is blocking connections selectively. If you create an exception for http://example.com/ (click the Advanced button on the error page, then add an exception), does it go straight to the site or does the router show any messages?

Do you want me to go to https or http? The latter does not result in an error page

So under DNS over HTTPS setting in the setting menu I switched to Max Protection and that seemed to have fixed everything.

Thanks for all your help jscher2000

Thank you for reporting back. Are you using Cloudflare now, or a different DNS over HTTPS provider?

Thank you for reporting back. Are you using Cloudflare now, or a different DNS over HTTPS provider?

I am using Cloudfare which was the default