Hi, make sure the date on your computer is correct. When it is incorrect, Firefox and other browsers will report the certificates as being expired. Please also make sure you don't have any malware on your machine:

You can try these free programs to scan for malware, which work with your existing antivirus software:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• Anti-Rootkit Utility - TDSSKiller (for more info, see this alternate TDSSKiller download page)
• AdwCleaner (for more info, see this alternate AdwCleaner download page)
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista if you don't already have one. Windows 8/10 have antivirus protection built-in.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

Support Volunteers can't make changes to Firefox and the developers do not directly monitor this site. To submit suggestions for new or changed features, may I suggest:

Feedback: https://qsurvey.mozilla.com/s3/FirefoxInput/ Facebook: https://www.facebook.com/Firefox Reddit: https://www.reddit.com/r/firefox/ Twitter: https://twitter.com/firefox

Please let us know if this solved your issue or if need further assistance.

foxxe-1 said

Ever since version 51 came out, I can't even log into my own router without your software attempting to tell me it is an unsafe site!! SERIOUSLY you much be new to the internet, unlike your predecessors in Mozilla! The internet has ALWAYS been "unsafe" since the corporate world invaded and destroyed it for all intellectuals! I don't need a nag screen warning me everytime I log into one of the MILLIONS of http sites that it is UNSAFE!! You NEED TO FIX THIS ERROR or I will drop Mozilla entirely and look for something that is less OCD!

NOT EVEN CLOSE! This issue you speak of is something I learned about back in 1993!! And is in NO WAY RELATED to this issue.

READ THE POST AGAIN PLEASE. The clues are ALL THERE. ANY BUILD, post v.50.0, ALL have the SAME PROBLEM!

If you log into an HTTP site (notice I didn't say HTTPS??) you AUTOMATICALLY GET NAGGED that it "is not a safe site". IT HAS NOTHING AT ALL TO DO WITH CERTIFICATES! It is the software code that apparently ONLY ACCEPTS HTTPS as "safe" (although any idiot on the internet knows that there is no such thing as "safe" on the internet)

Also I run about 4 different spyware, malware and virii scanners (I used to get hit all the time back before the internet became a Mecca for spam and trolls)

Malwarebytes... got it MSIE................... got it ESET...................Long time user AntiRootkit killer I will NEVER TOUCH EVER AGAIN as it did EXTREME DAMAGE to my machine 2 and a half years ago. Hitman Pro ......I tried once and it installed malware on my machine. ADWCleaner.........I don't use unknowns as they are more often than not, malware installers themselves.

Firefox 51+ will mark HTTP connections with a padlock with a strike through and shows "Connection is Not Secure" if you click the Control Center 'i' button at the left end of the location/address bar.

Note that this message is meant as a warning that you could be vulnerable and that it shouldn't prevent (block) you from accessing the website.

You can press the ESC key to close a doorhanger with a warning message in the name and password field.

See also:

• https://support.mozilla.org/en-US/kb/how-do-i-tell-if-my-connection-is-secure
• https://support.mozilla.org/en-US/kb/insecure-password-warning-firefox
• https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

More:

• https://blog.mozilla.org/tanvi/2016/01/28/no-more-passwords-over-http-please/
• https://blog.mozilla.org/security/2017/01/20/communicating-the-dangers-of-non-secure-http/

You can remove the warning in the location bar by setting this pref to false on the about:config page.

• security.insecure_password.ui.enabled = false

You can disable the warning that opens when you type in a name/password field by setting this pref to false.

• security.insecure_field_warning.contextual.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

cor-el said

Firefox 51+ will mark HTTP connections with a padlock with a strike through and shows "Connection is Not Secure" if you click the Control Center 'i' button at the left end of the location/address bar.

Note that this message is meant as a warning that you could be vulnerable and that it shouldn't prevent (block) you from accessing the website.

You can press the ESC key to close a doorhanger with a warning message in the name and password field.

See also:

• https://support.mozilla.org/en-US/kb/how-do-i-tell-if-my-connection-is-secure
• https://support.mozilla.org/en-US/kb/insecure-password-warning-firefox
• https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

More:

• https://blog.mozilla.org/tanvi/2016/01/28/no-more-passwords-over-http-please/
• https://blog.mozilla.org/security/2017/01/20/communicating-the-dangers-of-non-secure-http/

You can remove the warning in the location bar by setting this pref to false on the about:config page.

• security.insecure_password.ui.enabled = false

You can disable the warning that opens when you type in a name/password field by setting this pref to false.

• security.insecure_field_warning.contextual.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

cor-el said

Firefox 51+ will mark HTTP connections with a padlock with a strike through and shows "Connection is Not Secure" if you click the Control Center 'i' button at the left end of the location/address bar.

Note that this message is meant as a warning that you could be vulnerable and that it shouldn't prevent (block) you from accessing the website.

You can press the ESC key to close a doorhanger with a warning message in the name and password field.

See also:

• https://support.mozilla.org/en-US/kb/how-do-i-tell-if-my-connection-is-secure
• https://support.mozilla.org/en-US/kb/insecure-password-warning-firefox
• https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

More:

• https://blog.mozilla.org/tanvi/2016/01/28/no-more-passwords-over-http-please/
• https://blog.mozilla.org/security/2017/01/20/communicating-the-dangers-of-non-secure-http/

You can remove the warning in the location bar by setting this pref to false on the about:config page.

• security.insecure_password.ui.enabled = false

You can disable the warning that opens when you type in a name/password field by setting this pref to false.

• security.insecure_field_warning.contextual.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

So far you have not told me how to turn this shit OFF yet! The information icon indicates a yes/no permission yet does NOT allow you to actually USE this phantom permission button!!

So far you guys have been basically quoting crap from a support telemarketer's card (IE "is the machine plugged in") crap.

I came here for support and so far I got less than nothing. The first response was from a guy who didn't even read the damned post! "check the date on your computer" Seriously, NO router that I have EVER heard of issues a certificate NOR is it a "security issue"

This stuff just reminds me of the post 9/11 mass fear in the US where everything is suggested but NOTHING IS ACTUALLY DONE!!

foxxe-1 said

cor-el said

Firefox 51+ will mark HTTP connections with a padlock with a strike through and shows "Connection is Not Secure" if you click the Control Center 'i' button at the left end of the location/address bar.

Note that this message is meant as a warning that you could be vulnerable and that it shouldn't prevent (block) you from accessing the website.

You can press the ESC key to close a doorhanger with a warning message in the name and password field.

See also:

• https://support.mozilla.org/en-US/kb/how-do-i-tell-if-my-connection-is-secure
• https://support.mozilla.org/en-US/kb/insecure-password-warning-firefox
• https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

More:

• https://blog.mozilla.org/tanvi/2016/01/28/no-more-passwords-over-http-please/
• https://blog.mozilla.org/security/2017/01/20/communicating-the-dangers-of-non-secure-http/

You can remove the warning in the location bar by setting this pref to false on the about:config page.

• security.insecure_password.ui.enabled = false

You can disable the warning that opens when you type in a name/password field by setting this pref to false.

• security.insecure_field_warning.contextual.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

cor-el said

Firefox 51+ will mark HTTP connections with a padlock with a strike through and shows "Connection is Not Secure" if you click the Control Center 'i' button at the left end of the location/address bar.

Note that this message is meant as a warning that you could be vulnerable and that it shouldn't prevent (block) you from accessing the website.

You can press the ESC key to close a doorhanger with a warning message in the name and password field.

See also:

• https://support.mozilla.org/en-US/kb/how-do-i-tell-if-my-connection-is-secure
• https://support.mozilla.org/en-US/kb/insecure-password-warning-firefox
• https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

More:

• https://blog.mozilla.org/tanvi/2016/01/28/no-more-passwords-over-http-please/
• https://blog.mozilla.org/security/2017/01/20/communicating-the-dangers-of-non-secure-http/

You can remove the warning in the location bar by setting this pref to false on the about:config page.

• security.insecure_password.ui.enabled = false

You can disable the warning that opens when you type in a name/password field by setting this pref to false.

• security.insecure_field_warning.contextual.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

So far you have not told me how to turn this shit OFF yet! The information icon indicates a yes/no permission yet does NOT allow you to actually USE this phantom permission button!!

So far you guys have been basically quoting crap from a support telemarketer's card (IE "is the machine plugged in") crap.

I came here for support and so far I got less than nothing. The first response was from a guy who didn't even read the damned post! "check the date on your computer" Seriously, NO router that I have EVER heard of issues a certificate NOR is it a "security issue"

This stuff just reminds me of the post 9/11 mass fear in the US where everything is suggested but NOTHING IS ACTUALLY DONE!!

No, FORGET ABOUT IT! You can't help you are merely a collection of wannabe support trolls. If any of you actually know what you were saying you most certainly would NOT because helping someone that comes to support for help is just LUDICROUS!