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) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

(You also can clear Firefox's cache completely using:

orange Firefox button or Tools menu > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now")

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

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

Then try reloading the page. Does that help?

jscher2000: Ctrl+Shift+r solved my problem in one second.

Thanks.

I cleared all cache, history, and cookies. I did View Page Info, Security, View Cookies and cleared all FedEx cookies. I then did a Ctrl+Shift+r to reload and still got the blank page.

The FedEx page link is:

https://www.fedex.com/fedextrack/?cntry_code=us&tab=1&tracknums=&clienttype=wtrk

I viewed the Page Source and the basic HTML structure and code look intact.

The following is a snapshot of some of my current technical info:

 Application Basics

       Name
       Firefox

       Version
       18.0.1

       User Agent
       Mozilla/5.0 (Windows NT 5.2; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0

       Build Configuration

         about:buildconfig

 Extensions

       Name

       Version

       Enabled

       ID

       Adblock Plus
       2.2.1
       true
       {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

       DownloadHelper
       4.9.13
       true
       {b9db16a4-6edc-47ec-a1f4-b86292ed211d}

       huffsquish
       1.00.00
       true
       {6c076e6a-d294-4dc0-8223-7589df9c3d86}

       Microsoft .NET Framework Assistant
       0.0.0
       false
       {20a82645-c095-46ed-80e3-08825760534b}

       RealPlayer Browser Record Plugin
       15.0.2
       false
       {ABDE892B-13A8-4d1b-88E6-365A6E755758}

Hi stelgor, do you get just a two-toned gray background? The page will appear that way if JavaScript is blocked. Can you confirm JavaScript is enabled here:

orange Firefox button or classic Tools menu > Options > Content

Although external filters also can block JavaScript, it seems unlikely that FedEx would be filtered...

JavaScript is enabled. The FedEx site is set to allow pop-ups.

And, yes, all that displays is the two-toned gray background.

I started Firefox up in Safe Mode (add-ons disabled) and the FedEx site tracking now works. I will disable add-ons one-by-one to find the culprit.

PROBLEM SOLVED: The cause of the problem with the FedEx tracking page was not a Plugin -- it was an Extension. Specifically it was Adblock (2.2.1) that was evidently blocking too much. I disabled sets of Plugins until all were disabled and continued to have the problem. So, I started disabling Extensions until the problem was isolated to the Adblock Extension. I've left Adblock enabled but disabled on the specific FedEx page that was having the problem.

This actually resolved another problem that I was having with a different site. In the future, I will start with suspecting Plugins and Extensions before I blame Firefox for site display and/or behavior issues.

Thanks for leading me to the Safe Mode technique as a first step in researching these types of problems.