What happens when you try to access https://www.yahoo.com/ ? For example:

• Blank page or very limited/partial content
• Server not found error message
• Other error message (please copy/paste it)

Are any other sites affected?

Nothing happens. Doesn't go anywhere. Just stays on a blank page. No other sites seem to be affected. I also tried adding the https, and that didn't do anything either. Thanks!

P. S. No error messages either.

Do you get the same result if you click a link to Yahoo on another site, for example:

https://duckduckgo.com/?q=yahoo&ia=about

Could you double-check your Firefox connection settings here:

"3-bar" menu button (or Tools menu) > Options

In the left column, click Advanced. On the right side, click the "Network" mini-tab and then the "Settings" button.

The default of "Use system proxy settings" piggybacks on your Windows LAN connection settings, but you could try "No proxy" to see whether that makes a difference.

Before I do the LAN settings, something interesting I found. I got to this site using Firefox, from a link on Wikipedia: https://transparency.yahoo.com/ That link got to yahoo's site. Now, when one clicks on 'Home' on Yahoo, nothing happens. But when I click on Mail, it does go to Mail. So now I am wondering if it is a Yahoo problem?

Or something between Yahoo and Firefox? I noticed some of the links on Yahoo's page work, and some don't. If everything works in another browser, then it seems like it's something between Yahoo and Firefox?

I don't know how many users are affected at this point. It might just be specific Firefox configurations. Hard to say.

Should I also try the LAN settings you suggested?

miriampc said

Should I also try the LAN settings you suggested?

Yes, please.

I changed the LAN settings and refreshed Firefox, but it did not help. :-(

I can't think of any other settings you could change in Firefox.

Could you check for error messages this way:

Open a page that has a link to https://www.yahoo.com/ (such as this one) and then open Firefox's Web Console using either:

• Ctrl+Shift+k
• menu button > Developer > Web Console

This should open a panel in the lower part of the tab that may be empty or may list some error messages. If there are already messages there, click the Clear button.

Then click the link to Yahoo and watch the panel for any new error messages. Anything? You should be able to copy/paste it here.

Along the top of the developer tools panel are buttons, including Network. If you click Network, it should list the URLs that Firefox tried to load when you clicked the link. Anything strange there?

There were no error messages that showed up. Under Network, what shows is this: Method File Domain Type Transferred Size 0 ms

GET    /                    www.yahoo.com    plain            ---             0KB   -0 ms

Right before the yahoo domain listed, before the www, it shows a small image of a lock with a diagonal red line through it. I would have attached the whole image of everything, but this does not allow attachments. Thanks for your continued help.

Thanks. The slashed lock probably means that even though you followed an HTTPS link, Firefox didn't successfully make an SSL connection with the site.

I think you said you used Firefox's Refresh feature earlier today. That should clear away any saved certificate that could interfere with a fresh connection. I have to admit I'm running out of ideas.

Note: To attach a screen shot, you first need to save it to an image file, for example using the Paint program included with Windows. Alternately, you can paste it into a site like the following and then provide the link here (but then you might not be able to edit out parts you do not want to show): https://snag.gy/

Do a malware check with several malware scanning programs on the Windows computer.

• https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware

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

Just to let you all know, after seeing the above from Mozilla support, I decided to first run an active scan with my anti-virus software, ESET NOD 32. It worked! Everything is now fine after running ESET and rebooting.

Thank you all for your help.