Could you describe the problem in more detail:

Is Firefox displaying an error page, or is the page on the website completely blank, or is the layout broken (unstyled page)?

If Firefox is objecting to many/most website certificates after the Refresh, the Refresh may have broken Firefox's trust of your security/parental control software to intercept your connection. Avast, BitDefender, Bullguard, ESET, and Kaspersky, AVG LinkScanner / SurfShield, and Microsoft Family Safety can cause this issue.

If you have any of those specific security products:

That would be the first thing to check. This support article will walk you through it: How to troubleshoot security error codes on secure websites.

If none of those ring a bell:

You could inspect a sample certificate to see whether that points to the culprit. If you want to try that now, here's how I suggest starting:

Load my test page at: https://jeffersonscher.com/res/jstest.php

You likely will get an error page. Expand the "Advanced" button and look for an Add Exception button.

Note: You don't need to complete the process of adding an exception -- I suggest not adding one until we know this isn't a malware issue -- but you can use the dialog to view the information that makes Firefox suspicious.

Click Add Exception, and the certificate exception dialog should open.

Click the View button. If View is not enabled, try the Get Certificate button first.

This should pop up the Certificate Viewer. Look at the "Issued by" section, and on the Details tab, the Certificate Hierarchy. What do you see there? I have attached a screen shot for comparison.

Hi Jscher2000, Thank you for the email. In the address bar it shows green bank of America corporation (US), but the page is blank. No errors on the page ( just blank [white] page )and circle next to the mouse pointer continuously spinning. Same situation for the American express. It happening only on 2 computers. Rest of the computers are able to access those pages. All are using same antivirus ( Vipre ) all are seating on the same domain. Thanks

Hmm, are there any extra icons to the left of the address, such as:

• plugin notification icon: looks like a small, dark gray Lego block? (Click it for information on a plugin the page may want to use that isn't currently allowed to run on that site.)

• shield icon: indicates tracking protection is in effect on the site. (Click it for the option to suspend tracking protection for now.)

• other??

If that doesn't seem relevant, here are some more general suggestions for problems loading websites:

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Clear Firefox's Cache

See: How to clear the Firefox cache

If you have a large hard drive, this might take a few minutes.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either:

• right-click a blank area of the page and choose View Page Info > Security > "View Cookies"
• (menu bar) Tools > Page Info > Security > "View Cookies"
• click the padlock or "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button

In the dialog that opens, the site name will be filled in automatically at the top so you can remove the site's cookies individually.

Then try reloading the page. Does that help?

I did ssl, cleared cookies, even reset browser to default. Did not work. Deleted browser, restarted pc, downloaded fresh, installed, restarted - did not work. Used system restore and restored pc to the last restore point. Now it is working ok. But still don't understand what had happened and why. Thank you All for the help

You can check the log in the Web Console for error messages and the Network Monitor (Firefox/Tools > Web Developer) to see if content fails to load or is possibly blocked.

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

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10