As you are using Firefox Beta, you should have used a new profile. Also, this version is known to reject some certificates, so perhaps blame Symantec or the websites affected in case you have connection issues.

Please remain kind on this forum and think what could be wrong at your end before blaming Mozilla in a rude way. Also take note of the Mozilla Support rules and guidelines.

Do you need additional help?

What has Symantec to do with it? 3 other browsers on this computer work fine. Firefox tells me all sites are suspect. ALL sites.

So, G'bye!

Loved you long time.

I might have told you when you had the proper attitude and am a little surprised you don’t know nor understand the answer as a long-time Firefox user, but am sure you know how to use a search engine using one of your other browsers.

Good bye. ;)

TDale said

What has Symantec to do with it? 3 other browsers on this computer work fine. Firefox tells me all sites are suspect. ALL sites. So, G'bye! Loved you long time.

See https://blog.mozilla.org/security/2018/03/12/distrust-symantec-tls-certificates/

Since you are using the Firefox 60.0b# Beta channel builds and not 59.0.2 you are seeing changes like this sooner.

See also:

• https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean
• https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER