That seems rather odd. Short of having scriptblockers or malware targeting the site it would be unusual for only that site not to work.

What happens if you try other versions of the site, do they work ?

• https://www.mozilla.org/en-GB
• https://www.mozilla.org/fr
• (I am getting green lights on https://status.mozilla.org/ )

Please try with a new additional Firefox profile, that will not have changed with a standard new install

• Profile Manager - Create, remove or switch Firefox profiles

The standard list of checks is:

• Firefox can't load websites but other browsers can
  • Websites look wrong or appear differently than they should

You can check the Net log and the Network log in the Web Console (Firefox/Tools > Web Developer) to see if content fails to load or possibly is blocked (file size is zero).

• https://developer.mozilla.org/Tools/Network_Monitor

Use Ctrl+F5 or Ctrl+Shift+R to reload the page and bypass the cache to generate a fresh log.

John99 said

That seems rather odd. Short of having scriptblockers or malware targeting the site it would be unusual for only that site not to work. What happens if you try other versions of the site, do they work ?

• https://www.mozilla.org/en-GB
• https://www.mozilla.org/fr
• (I am getting green lights on https://status.mozilla.org/ )

Please try with a new additional Firefox profile, that will not have changed with a standard new install

• Profile Manager - Create, remove or switch Firefox profiles

The standard list of checks is:

• Firefox can't load websites but other browsers can
  • Websites look wrong or appear differently than they should

The issue is the same on different language versions and also with a new profile.

cor-el said

You can check the Net log and the Network log in the Web Console (Firefox/Tools > Web Developer) to see if content fails to load or possibly is blocked (file size is zero).

• https://developer.mozilla.org/Tools/Network_Monitor

Use Ctrl+F5 or Ctrl+Shift+R to reload the page and bypass the cache to generate a fresh log.

No, I can't open Web Console, because that crashes Firefox.

Have you got the crash report, or if it is not actually crashing then a screenshot and a copy of any error message. When I say crash report all we need is the Crash ID, the string of letters and numbers beginning with bp- that you may find when you navigate to about:crashes

While you are at it also please attach a screenshot of the site showing text only.

• How do I create a screenshot of my problem?

We're sorry to hear that Firefox is crashing. In order to assist you better, please follow the steps below to provide us crash IDs to help us learn more about your crash.

1. Enter about:crashes in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
2. Copy the 5 most recent Report IDs that start with bp- and then go back to your forum question and paste those IDs into the "Post a Reply" box.

Note: If a recent Report ID does not start with bp- click on it to submit the report.

(Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.)

Thank you for your help!

More information and further troubleshooting steps can be found in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

Here are the Crash IDs: bp-cea4562a-0af2-451b-9983-16aeb2150812 bp-09b0dc11-7ef6-4057-b9c0-f08502150812 bp-b6120fe4-6492-4293-be47-649c42150812 bp-a61ae8d0-cf2b-4b9e-9233-813be2150812 bp-1f257797-7a76-4f50-a1af-b66fd2150812

I can reproduce a crash of Firefox in three ways with 100% reliability: 1. click on the + icon to open a new tab 2. click on a picture within a wikipedia article to enlarge it 3. try to open the Firefox Net Log

I tried to completely uninstall Firefox, including the user settings by following these instructions: http://kb.mozillazine.org/Uninstalling_Firefox, but this didn't solve any of the issues.

I know how to fix the the new tab issue, but not the other issues.

Windows has been updated from Windows 7 to Windows 10 and I also exchanged my old Nvidia card for a new AMD graphics card recently, not sure if either is part of the problem.

Below is a screenshot of this very page opened in Firefox and one of the Firefox Health Report, displaying a 'Secure Connection Failed' error.

I just installed a Windows security update, that was offered today and the crashes no longer happen. The issues with the Mozilla website not being displayed correctly and the Secure Connection Failed error at the Firefox Health Report are still there, though. But now I can view the Web Console.

This is the output for this page:

This site makes use of a SHA-1 Certificate; it's recommended you use certificates with signature algorithms that use hash functions stronger than SHA-1.[Learn More] 1077232 Use of getPreventDefault() is deprecated. Use defaultPrevented instead. 245885873.js:95:0

hi, please try to disable https scanning within avast:

1. Open the Avast dashboard on the affected system.
2. Select Settings from the left sidebar menu.
3. Switch to Active Protection.
4. Click on Customize next to Web Shield.
5. Uncheck the "Enable HTTPS Scanning" option and click ok.

http://www.ghacks.net/2014/10/31/avasts-https-scanning-interferes-with-firefox-and-other-programs/

philipp said

hi, please try to disable https scanning within avast:

1. Open the Avast dashboard on the affected system.
2. Select Settings from the left sidebar menu.
3. Switch to Active Protection.
4. Click on Customize next to Web Shield.
5. Uncheck the "Enable HTTPS Scanning" option and click ok.

http://www.ghacks.net/2014/10/31/avasts-https-scanning-interferes-with-firefox-and-other-programs/

Yes, that solved it. Still curious why this started to be an issue right now and never was before for me. Also the timely coincidence with the issue caused by a Windows security fix that was solved by another Windows security fix. That was so annoying. Really big thank you to all who answered. Can't really imagine to use Chrome or IE or Edge.

The avast thing worked for me too.