Mozilla doesn't force users to "take Nightly". There are different webpages for downloading Nightly, Beta / Developer Edition, and Release version builds, along with the ESR (Extended Support Release) builds of Firefox.

You can download the current Release version of Firefox; the off-line installer from here: https://www.mozilla.org/en-US/firefox/all/

Hi Crackaig, many eBay sellers embed content from third party sites, and Firefox needs to verify the certificates for that content independently of eBay's certificate.

You should never need to make exceptions for well-run sites, so if this problem goes beyond individual sellers, you should pause and review these articles or let us have more information about the specific error code you get.

• What do the security warning codes mean?
• How to troubleshoot security error codes on secure websites

You definitely do not need to run nightly. If you'd rather not be using Nightly, please downgrade to the regular version of Firefox.

I'm interested who told you that you had to use nightly? That's something we'd like to correct.

This is likely an issue with Symantec certificates that are no longer trusted in Nightly. In Nightly all Symantec certificates are distrusted instead of only older certificates like in the current Firefox release.

You can revert this Symantec certificate block by setting this pref to 1 on the about:config page. In Nightly this pref is currently 2.

• security.pki.distrust_ca_policy = 1

certificate-issued-by-a-authority-belonging-to-symantec

• https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER

Since you are Testing the Nightly channel builds of Firefox 63.0a1 you are seeing changes sooner like explained at https://blog.nightly.mozilla.org/2018/08/14/symantec-distrust-in-firefox-nightly-63/

Crackaig said

Getting really frustrated with security exceptions. When I went to download Firefox I was forced to take Nightly, Would not have had it had a choice been available.

Where did you download the Nightly channel build of Firefox from? hopefully not some random download site as some may not be serving the version that they claim it to be.

If you go to www.mozilla.org or www.mozilla.org/firefox/all/ then you would only be served the latest Release based on the OS in your web browser being used on site so Firefox 61.0.2 for Windows.

If you were looking for 64-bit (Win64) Firefox release for Windows well Win64 Firefox for Release has existed since 42.0 (November 3, 2015) from Mozilla.

the-edmeister said

Mozilla doesn't force users to "take Nightly". There are different webpages for downloading Nightly, Beta / Developer Edition, and Release version builds, along with the ESR (Extended Support Release) builds of Firefox. You can download the current Release version of Firefox; the off-line installer from here: https://www.mozilla.org/en-US/firefox/all/

I simply put "Firefox" into Google. I believed I was on the official site. the only version I could download from there was Nightly. There was no obvious link to any other version. The problem is getting worse now I can't get into PayPal. Who thinks that putting a restriction in the browser like this is either useful or helpful?

Tyler Downer said

You definitely do not need to run nightly. If you'd rather not be using Nightly, please downgrade to the regular version of Firefox. I'm interested who told you that you had to use nightly? That's something we'd like to correct.

You can switch to regular Firefox, by downloading it from www.getfirefox.com.

Nightly is a development version of Firefox, meant to developers and testers. If you aren't in that group, you should use regular Firefox.

As I just replied to a previous answer I just searched "Firefox" in Google and went to what purported to be the official site. There was no link obvious to any other version. It was take it of do without. The problem is getting worse I now can't access Pay Pal. I contacted Pay Pal using safari on my phone. They assure me they have not changed their security systems in the last couple of days. That being the case why was it considered secure Monday, but is insecure today? I still don't see how you they can offer only 1 option and call it a recommended action.

As i said, switch to regular Firefox and paypal will work.

Paypal's systems are actually not secure, they use certificates that are considered insecure, and in Nightly we have begun to warn users. But for now, regular Firefox works just fine.

https://blog.mozilla.org/security/2018/07/30/update-on-the-distrust-of-symantec-tls-certificates/