firefox Secure Connection Failed error occurred during connection receive data authentic not verify

JUST USE A NEWER BROWSER! ,, or?!
Please contact the website owners to inform them of this problem. The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. An error occurred during a connection to

Firefox uses certificates on secure websites to ensure that your information is being sent to the intended recipient and can't be read by eavesdroppers.
Make sure your computer is set to the correct date, time and time zone
or Firefox may think the site security certificate is expired or invalid.

disable any firefox or operating system addon, VPN or Proxy

in firefox settings,
general
network settings settings (at the bottom of that page )
Auto-detect proxy settings for this network (check mark )
then click OK

sslshopper.com/ssl-checker.html#hostname=costco.com
= = = = = = = = = things that are NOT advisable = = = = = = = = =

rename cert9.db file in your firefox profile folder ?

about:preferences#privacy

HTTPS-Only Mode
Don’t enable HTTPS-Only Mode

about:config
network.stricttransportsecurity.preloadlist false
browser.fixup.alternate.protocol from https to http
browser.fixup.fallback-to-https false
browser.urlbar.autoFill false
extensions.webextensions.restrictedDomains = add a domain name exception ?

= = = = = = = = = = = = in windows = = = = = = = = =
= = = = = = = = = CMD = = = = = = = = = = = =

ipconfig /release
ipconfig /renew
ipconfig /flushdns
ipconfig /registerdns
netsh int ip reset
netsh winsock reset
netsh winhttp reset proxy
restart computer

inetcpl.cpl
Advanced,
"Use SSL 3.0", "use TLS 1.0", "use TLS 1.1", "use TLS 1.2",

ncpa.cpl
double Click network you use to open its Network status window,
Properties,
Network Properties window.
double-click Internet Protocol Version 4(TCP/IPv4)
Manually set the DNS server to 4.2.2.1 and 4.2.2.2,
Use different DNS servers like google DNS servers
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