Firefox latest version unable to connect to internet
 

I am using Fedora 27 in Virtual Box. I just upgraded Firefox to latest version using "dnf install firefox". But after the update the firefox gave "Certificate error" to all the major websites like google, facebook, youtube etc. I tried "ping www.google.co.in" and it just worked fine. So I downgraded Firefox and things started to work fine again. Is there something wrong with latest Firefox Release? Or is there a glitch in my system?

I'm using Firefox v. 57.0.2 (64-bit) on Slackware with no issues. I also have v, 57.0.1 in a VirtualBox VM of Ubuntu 16.04 LTS which works just fine.

Try starting Firefox from the command line. Perhaps it will through a useful error message. Also, a web search for the specific error message you are receiving may help. A general search for "Firefox certificate error" yielded too much variety to be useful.

F/F 57.0.1 runs fine in F27 here. Can't remember when it was originally installed, been upgraded so often.

test this involves browsing to about:config and setting browser.tabs.remote.autostart2 to false.

Actual error was something like this, "Google is using outdated certificates. Your connection may not be secure". Same type of error for facebook, youtube etc. I even checked my system timings and it was upto date. Some websites like "www.pdfdrive.net" which doesnt have https encryption was working just fine. Problem was I think only with https websites.