The messages suggest that your browser is viewed as suspicious for some reason. Have you customized your Firefox in a way that might modify the information it sends to websites? An example would be changing privacy settings to block cookies, or using add-ons that scramble up, randomize or omit information sites normally expect to receive.

Otherwise, I would suggest trying "the usual":

If a site is generally known to work in Firefox, these are general suggestions to try when it stops working:

Cache and Cookies: 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. If you do not see the number going down on the page, you can reload it using Ctrl+r to check progress.

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

• right-click (on Mac Ctrl+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 current site should be pre-filled in the search box at the top of the dialog so you can remove that site's cookies individually.

Then try reloading the page. Does that help?

Testing in Firefox's Safe Mode: In Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement? (More info: Diagnose Firefox issues using Troubleshoot Mode)

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks and history and cookies and passwords and cache and exceptions, so be cautious. If you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data from that website will be saved once again.

• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

Thanks for the replies. None of the solutions worked. I did learn how to use "Forget About This Site".

I just found out that I can not use Chrome or IE to go to walmart.com on this PC. This looks like a walmart.com problem.

Could you run some malware scans? Just in case there's something in the background that does suspicious things when you try to visit Walmart's website. Our support article lists a number of cleaning tools other Firefox users have found helpful: Troubleshoot Firefox issues caused by malware. They're either free, or have a free trial that doesn't require a credit card.

I run Malwarebyte and AVG antivirus daily. There are no virus on my PC.

I can use Chrome to access walmart.com again.

Firefox and IE are still having problems.

Hi, do you have an opened session on walmart.com? I mean, do you have your account opened?