Can't skip "This Connection is Untrusted" error page

The SSL certificate for one of the sites I use expired today a couple hours ago, and the devs of that site still haven't had spare time to update it yet. Suppose it's not a big issue, in most (other) browsers you can just review the problem and click on "continue anyway" link or something like that, when you're sure that the certificate was expected to become invalid. So you can visit the page requested with broken certificate in _single_ click. But not in Firefox.
As I remember - some time ago on the Cert Error page there was "I understand the risks" paragraph with the button "Add exception" below. Looks like it got disabled in Firefox 30 as I don't see it there. Okay, I googled around and found out that in about:config page there's a secret option browser.xul.error_pages.expert_bad_cert which was in disabled state by some reason (I personally haven't ever touched it before). Okay, now I'm able to open the ugly "Add exception" window, but when I add exception - nothing happens. Neither temporary not permanent exception option allowes me to view the site. "This Connection is Untrusted", browser says. Period.
After that I've tried to install "Skip cert error" add-on - with no success. Even if I add the site URL to whitelist in add-on options, which "in theory" should bypass ANY security checks for this exactly domain - then I still end up staring at "This Connection is Untrusted" error which simply can't be bypassed by any means.
The sites I've tried to reach are https://lists.openwrt.org and https://forum.openwrt.org. It's interesting though, the certificate is also expired at https://openwrt.org, but that site can be added to exception list and then firefox opens it. However I see completely NO WAY to make firefox open https://lists.openwrt.org or https://forum.openwrt.org.
I've run out of ideas and came here. Hope somebody knows how to workaround this issue.
PS: I wonder why the hell there's no option to bypass the check by some _simple_ means like in other browsers so that I could reach requested site in seconds rather then searching for settings/addons/workarounds for hours. Thank you firefox for such enourmous care for security, you've made me run Internet Explorer again...
Update 1:
It appears that in this case the certificate was registered for domain openwrt.org, but was also used for forum and lists subdomains. Now it is expired, but the expiration issue can be ignored by exception list only for openwrt.org itself. Other subdomains are actually added to exception list, but it doesn't work for them, so that browser is stuck at "untrusted connection" error which can't be ignored or skipped. What a shame.
Update 2:
I was quiet wrong in Update 1: in fact the SSL certificate for openwrt.org was Level 2 certificate with correcly registered subdomains like forum.openwrt.org and lists.openwrt.org. However when the certificate expired, only openwrt.org exception worked and the site was browseable. All the subdomains could be added to exceptions but regardless of that fact firefox refused to open those sites and was stuck on unskippable "untrusted connection" error page.
For now openwrt.org maintainers have already renewed their certificate so the problem can't be observed on those domains anymore. However I believe that the problem in firefox exceptions handling still exists and should be fixed in future firefox releases.

Hi kozaki, this thread is about an older version of Firefox. Could you start a new question?
For what it's worth, I see the "I understand the risk" section of this page in Firefox 33.0.3: https://forum.anomos.info/ -- but I have not added an exception for the top level site, so maybe that's a partial explanation for the difference.
Also, a new release of Firefox is out today which makes some changes for certificate issues.
To start a new Q: https://support.mozilla.org/questions/new/desktop/fix-problems
If the suggested articles are not useful, scroll past them to continue with the form.

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Application Basics
Name: Firefox
Version: 33.1.1
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
Multiprocess Windows: 0/1
Crash Reports for the Last 3 Days
All Crash Reports
Extensions
Name: Troubleshooter
Version: 1.1a
Enabled: true
ID: [email protected]
Name: WebEx Productivity Tools
Version: 2.0
Enabled: false
ID: [email protected]
Graphics
Adapter Description: Intel(R) HD Graphics 4600
Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
Adapter RAM: Unknown
Device ID: 0x0416
DirectWrite Enabled: false (6.1.7601.18245)
Driver Date: 6-3-2013
Driver Version: 9.18.10.3204
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GPU Accelerated Windows: 0/1 Basic (OMTC)
Vendor ID: 0x8086
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: skia
AzureContentBackend: cairo
AzureFallbackCanvasBackend: cairo
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browser.cache.disk.capacity: 358400
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browser.places.smartBookmarksVersion: 7
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in case the error code equals ''sec_error_unknown_issuer'', please attempt to add an exception on the bottom of the error page & inspect the certificate (see the screenshot attached for instructions):
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Trying to access any website and I get the "this connection is untrusted" error come up.
Sites like the FireFox addons, Facebook, Tumblr, etc etc.
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Example:

Every time I try to log into ANY website that is secured, I get an error message "This connection is untrusted."

The error message is:
This Connection is Untrusted
You have asked Firefox to connect securely to www.facebook.com, but we can't confirm that your connection is secure.
Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified.
What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
www.facebook.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)
If you understand what's going on, you can tell Firefox to start trusting this site's identification. Even if you trust the site, this error could mean that someone is tampering with your connection.
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Steps I have take so far:
Verified that system clock is correct
Cleared all cache, history, cookies, etc.; didn't help
Started Firefox in Safe Mode; didn't help
Disabled all Firefox extensions; didn't help
uninstalled and reinstalled Firefox using Control Panel; didn't help
Ran Microsoft Safety Scan for malware; nothing was found
Other information:
This problem exists ONLY in my user profile and ONLY in Firefox. All 5 other users can run Firefox with no problem. I can run IE and Chrome with no problem.
Problem exists in ALL secured (https) sites.
I use Avast and Windows Firewall. Had never heard of ESET or BitDefender before searching these forums.
A lot of the sites don't give me the option to Make an Exception. The two that I tried to make exceptions for, still wouldn't open.
Run Windows 7 64-bit

unfortunately the fiddler2 issuer in certificates might be a sign of unwanted software present on your pc that is intercepting secure network traffic. please go into the system control panel and uninstall programs like BrowserSafeguard, BrowserSafe, SafeGuard or other software that sounds suspicious and didn't get installed by you intentionally.
 reference: https://support.mozilla.org/en-US/questions/982532#answer-520145
afterwards, run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner].
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Okay, before you copy 'n paste canned responses, you should read the post first.
'''The date & time on my computer is correct''' I've already checked this.
'''I don't give a damn why the site is untrusted''', I probably know why in fact (behind corporate proxy server).
As for exporting a known good certificate from another browser, sure good idea, but it doesn't seem to work. I tried exporting from IE, Firefox did the import without complaint, but it still complains. At any rate, I don't care about that. '''I just want to permanent disable it for ALL SITES for ALL TIME'''. Is that too much to ask for?
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This connection is untrusted with Error code: sec_error_unknown_issuer.

Hello,
When I try to open G-Mail & twitter and some other trusted websites, I got the following warning "This Connection is Untrusted" with Error code: sec_error_unknown_issuer.
For most of the site, I can bypass by clicking « I understand the risk » but this is a bummer but for Gmail and Twitter, there is no other button than "Get me out of here"
When I go through « about:support » and « reinitialise » system, I no longer have the problem, but not only it erases all my personnal set-up but the problem always come back when I restart my system
Date and time are set right.
I have also tried to reinstall completely FIREFOX to no avail
I am using McAfee Total protection 2014 & Firefox 31.0 on Windows 7 64 bits.
I have had this problem for the last 5 days and only Firefox.
Other Browser ( IE8.0) is working fine
I have searched for solutions but they all failed -
Deleting cert8.db did not solve the problem either
How do I solve this Problem?
Thanks and Regards

You can check the connection settings.
*Tools > Options > Advanced > Network : Connection > Settings
*https://support.mozilla.org/kb/Options+window+-+Advanced+panel
If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.
See "Firefox connection settings":
*https://support.mozilla.org/kb/Firefox+cannot+load+websites+but+other+programs+can
Do a malware check with several malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: http://windows.microsoft.com/en-us/windows/using-defender
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Website box says, ' this connection is untrusted, can't confirm it's secure'.

I'm trying to open a secure website. a box comes up, it reads:
'this connection is untrusted... can't confirm connection is secure... this sites identity can't be verified... this error could mean someone is trying to impersonate the site.' I called the company and they said it is my browser. I don't know what to do?

Check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
Check out why the site is untrusted and click "Technical Details" to expand this section.
If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) then see if you can install this intermediate certificate from another source.
You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.
*Click the link at the bottom of the error page: "I Understand the Risks"
Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".
*Click the "View..." button and inspect the certificate and check who is the issuer of the certificate.
You can see more Details like intermediate certificates that are used in the Details pane.
If "I Understand the Risks" is missing then this page may be opened in an (i)frame and in that case try the right-click context menu and use "This Frame: Open Frame in New Tab".
*Note that some firewalls monitor (secure) connections and that programs like Sendori or FiddlerRoot can intercept connections and send their own certificate instead of the website's certificate.
*Note that it is not recommended to add a permanent exception in cases like this, so only use it to inspect the certificate.

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