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  • Archived

Avast Security Browser Extension not staying enabled after upgrading to Firefox 66.0

Yesterday I upgraded to the newest version of Firefox (66.0, 64-bit). I use Avast Antivirus for virus protection, and I noticed after I upgraded to the new version of Fir… (read more)

Yesterday I upgraded to the newest version of Firefox (66.0, 64-bit). I use Avast Antivirus for virus protection, and I noticed after I upgraded to the new version of Firefox and went to go online, the Avast Online Security Browser Extension showed that the automatic blocking of trackers was disabled, so I clicked More Settings and re-checked the things that were previously unchecked (the do not track boxes), afterwhich I clicked Save, and everything was A-OK.

After I was finished, I closed the page I was on.

When I went back in awhile later, the same thing occurred, and I had to do the same thing all over again.

I'm not sure what to do so I don't have to keep repeating the same process over & over again. Any help would be greatly appreciated, as I'm unsure whether this is Firefox-related or Avast-related. I did post over at Avast's forums, too.

Thanks in advance.

Asked by IwakuraLain 1 year ago

Last reply by Pj 1 year ago

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  • Archived

Your connection is not secure HTTP Strict Transport Security (HSTS)

After I updated to v65.0 (x64), all webpages (except Yahoo) gave me: "Your connection is not secure. This site uses HTTP Strict Transport Security (HSTS) to specify that… (read more)

After I updated to v65.0 (x64), all webpages (except Yahoo) gave me: "Your connection is not secure. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate."

I read about changing the "security.enterprise_roots.enabled" value to "true" rather than the default "false" and this works, but I am afraid of future consequences.

I am using the following extensions in my Firefox installation: uBlock Origin, Disconnect

Operating system: Windows 7 Javascript enabled: Yes Cookies enabled: Yes Flash version: 32.0.0 Java version: Not installed Websockets supported: Yes Your full user agent string is: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

Asked by zebra14 1 year ago

Answered by zebra14 1 year ago

  • Archived

security override

I need to override the CONNECTION IS NOT SECURE error message. It is affecting almost all my browsing pages. I will have to leave Firefox and got to Internet Explorer f… (read more)

I need to override the CONNECTION IS NOT SECURE error message. It is affecting almost all my browsing pages. I will have to leave Firefox and got to Internet Explorer for good if this is not resolved. Also what is a telephone number I can use to call Firefox support?

Asked by PaulineLane 1 year ago

Last reply by PaulineLane 1 year ago

  • Archived

How do I fix this (check screenshot attached)? google.com does not open

Your connection is not secure The owner of www.google.com has configured their website improperly. To protect your information from being stolen, Firefox has not connecte… (read more)

Your connection is not secure

The owner of www.google.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.

Learn more…

Report errors like this to help Mozilla identify and block malicious sites

www.google.com uses an invalid security certificate.

The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported.

Error code: SEC_ERROR_UNKNOWN_ISSUER

Asked by Khozema 1 year ago

Last reply by philipp 1 year ago

  • Archived

Firefox 65.0 won't load Twitter - insecure site

My firefox on Win 10 just "updated" to 65.0, and how won't load twitter.com, claiming "Your connection is not secure", claiming the certificate is faulty. The denial of … (read more)

My firefox on Win 10 just "updated" to 65.0, and how won't load twitter.com, claiming "Your connection is not secure", claiming the certificate is faulty. The denial of service page doesn't even have a work around to allow an exception. What damn idiot programmed this update?

Asked by dbaker586 1 year ago

Last reply by dbaker586 1 year ago

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  • Archived

Firefox updated today 65.0 and is now INTERMITTENTLY blocking all my sites

Message below is a Firefox message and is intermittent. Closing and opening Firefox will cure it for a while and then I am blocked again on next opening. Even your own … (read more)

Message below is a Firefox message and is intermittent. Closing and opening Firefox will cure it for a while and then I am blocked again on next opening. Even your own links are showing with no HTML only text! I am having to close and reopen several times before I can get back to Facebook or Messenger or even MY BANK.

"Your connection is not secure

"The owner of www.facebook.com has configured their web site improperly. To protect your information from being stolen, Firefox has not connected to this web site.

"This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.

"Learn more…

"Report errors like this to help Mozilla identify and block malicious sites

Asked by Sue L 1 year ago

Answered by philipp 1 year ago

  • Solved
  • Archived

Certificate errors prevent me from accessing safe sites

I am unable to access my gmail account or my Linkedin account with FireFox. I get a certificate error SEC_ERROR_UNKNOWN_ISSUER yet this is a valid site and account. When… (read more)

I am unable to access my gmail account or my Linkedin account with FireFox. I get a certificate error SEC_ERROR_UNKNOWN_ISSUER yet this is a valid site and account. When Firefox gives the error it will not allow me to add a certificate exception, so I cannot use Firefox for these sites and probably others.

Asked by MadScientist8 1 year ago

Answered by FredMcD 1 year ago

  • Solved
  • Archived

www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending t

I'm getting errors above after Firefox update Jan 29, 2019, Google, Yahoo, IBM, and Amazon sites are unreachable for me now using Firefox but Chrome browser works fine. … (read more)

I'm getting errors above after Firefox update Jan 29, 2019, Google, Yahoo, IBM, and Amazon sites are unreachable for me now using Firefox but Chrome browser works fine.

Asked by Ronald Newton 1 year ago

Answered by FredMcD 1 year ago

  • Archived

Ver65.0 autodownloaded. Firefox now shows "Connection Not Secure" to even Mozilla webpages.

Since ver 65.0 auto downloaded, Firefox shows "Connection Not Secure" to patently obvious safe webpages eg: .org.uk; bbc.co.uk; Mozilla ! Most will not download at all. S… (read more)

Since ver 65.0 auto downloaded, Firefox shows "Connection Not Secure" to patently obvious safe webpages eg: .org.uk; bbc.co.uk; Mozilla ! Most will not download at all. Some show text like files all aligned left. All these webpages connected normally prior to the update. How do I revert to version 64? PS I clicked the troubleshooting Info "Auto Add" button below on my previous attempt but the entire details completely wiped. I now see in my Inbox a "notifications@support.mozilla.org" message to complete joining but clicking that just brings up a webpage of left aligned text. So please respond by email

edit: removed your mail address from public display, since the only thing it will attract are spam bots. you will be notified per mail once somebody replies to the thread. (philipp)

Asked by ForestWhip 1 year ago

Last reply by philipp 1 year ago

  • Solved
  • Archived

Why is Firefox now blocking access to sites including accounts.firefox.com citing "invalid security certificate"

Since the last update Firefox is blocking access to sites like Facebook and Google citing "invalid security certificate". It asked me to log on but blocked that too as a… (read more)

Since the last update Firefox is blocking access to sites like Facebook and Google citing "invalid security certificate". It asked me to log on but blocked that too as accounts.firefox.com also has an invalid certificate apparently. What is going on?

Asked by Leatherdale 1 year ago

Answered by philipp 1 year ago

  • Archived

Both my wife and my grand daughter get ERROR messages when loging on to sites formerly accessed by bookmarks, since your last UPDATE....!

When my wife tries to log on, she gets a "LIST" of items on Wells Fargo site. The page does NOT propagate properly and gets an error that it is NOT a secure site (HTTPS) … (read more)

When my wife tries to log on, she gets a "LIST" of items on Wells Fargo site. The page does NOT propagate properly and gets an error that it is NOT a secure site (HTTPS) when it actually is. My grand daughter tries to log on to her 'on line' home school site and gets the same error message, that it is not secure

This all has occurred since your last UPDATE.... PROBLEM problem problem!!!!

Asked by cehs 1 year ago

Last reply by cor-el 1 year ago

  • Archived

Every website returns "Your connection is not secure"

The obvious response is; • Check that your clock is correct (why wouldn't it be?) • There is a problem with your firewall/proxy/anti-virus But it is a strange coincidence… (read more)

The obvious response is; • Check that your clock is correct (why wouldn't it be?) • There is a problem with your firewall/proxy/anti-virus

But it is a strange coincidence that everything was working fine when I shut down the computer before retiring for the night… And this morning, on startup, Firefox installs an upgrade, and now every site is blocked.

Coincidence? Hmmm.

Asked by DavidGreen 1 year ago

Last reply by DavidGreen 1 year ago

  • Archived

Firefox won't let access ANY website on the internet like usual. I either get completely blocked or i have to give permission

New version just downloaded and now I can't access anything on the internet. Either I'm totally blocked or I have to give permission. How do I disable new security "disas… (read more)

New version just downloaded and now I can't access anything on the internet. Either I'm totally blocked or I have to give permission. How do I disable new security "disaster"? The blocking messages are all warnings that sites aren't okay - even GOOGLE is "bad". What the????

Asked by TaraW 1 year ago

Last reply by philipp 1 year ago

  • Solved
  • Archived

Every site I try to visit its saying insecure connection why?

I am a researcher and there isn't a better browser on the planet to do what I do then Firefox. Today when I tried to go on antiwar.com it kept giving me an error saying t… (read more)

I am a researcher and there isn't a better browser on the planet to do what I do then Firefox. Today when I tried to go on antiwar.com it kept giving me an error saying the connection was insecure, the same thing with youtube or any other site I tried to visit. Firefox had just updated so I figured that is what the issue was, I deleted and reinstalled and it still did it. Finally, as I was writing this ticket it worked, but I didn't change any settings or anything it just started to work, I was wondering if you guys could tell me how I could avoid that annoying situation from happening again? If Firefox doesn't work I don't browse, I simply don't trust any other browser.

Asked by Joziah 1 year ago

Answered by philipp 1 year ago

  • Solved
  • Archived

Cannot acces any website usinf Firefox - MS Edge works fine

The following message occurs for all websites - "Your connection is not secure The owner of accounts.firefox.com has configured their website improperly. To protect your… (read more)

The following message occurs for all websites -

"Your connection is not secure

The owner of accounts.firefox.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.

Learn more…

Report errors like this to help Mozilla identify and block malicious sites"


"accounts.firefox.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. Error code: SEC_ERROR_UNKNOWN_ISSUER"

Asked by allemmon 1 year ago

Answered by philipp 1 year ago

  • Locked
  • Archived

last update does not accept https certificates, not even from google

locking this thread as duplicate, please continue at https://support.mozilla.org/en-US/que.../1248376 every site with https is rejected even google cannot work anymore … (read more)

locking this thread as duplicate, please continue at https://support.mozilla.org/en-US/que.../1248376

every site with https is rejected even google cannot work anymore

Asked by Hans_Metselaar 1 year ago

Last reply by philipp 1 year ago

  • Archived

Firefox crashes

The Firefox start page comes up fine but when I try to go to another website I get a massage that the site is not secure. This applies to all sites. I have Google availab… (read more)

The Firefox start page comes up fine but when I try to go to another website I get a massage that the site is not secure. This applies to all sites. I have Google available and I can go there to view all these sites but Firefox has all my bookmarks, etc and is much handier-- if it works. I've re-booted the computer as well as the 4G hotspot so this isn't the problem.

Asked by cowrustler 1 year ago

Last reply by philipp 1 year ago

  • Archived

All sites insecure. Cleared cache/cookies. Disabled Avast web scanning. Still persists

Looked through other support articles about this issue, tried the solutions: clearing the web cache and cookies, and disable Avast web scanning. I have no other antivirus… (read more)

Looked through other support articles about this issue, tried the solutions: clearing the web cache and cookies, and disable Avast web scanning. I have no other antivirus software. I am having to use Chrome to ask this question because this support site is not loading properly in Firefox.

Just switched to Firefox from Chrome, I'm about to switch back.

Asked by Chickenscratch93 1 year ago

Last reply by user633449 1 year ago

  • Archived

ff64 updated to ff65 now all sites are blocked. Is fix coming?

ff64 updated to ff65 now all sites are blocked. every site I go to I get this Your connection is not secure The owner of www.google.com has configured their website imp… (read more)

ff64 updated to ff65 now all sites are blocked.

every site I go to I get this

Your connection is not secure

The owner of www.google.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.

Learn more…

Even this site did not work until I ADD EXCEPTION

What is fix for this problem? Win 7

Asked by gondorffmoz 1 year ago

Last reply by philipp 1 year ago