It;s very difficult to try to help figure out problems at websites that can't be accessed.

Please access the Web Console - https://developer.mozilla.org/en-US/docs/Tools/Web_Console - and copy / paste the messages you see.

Firefox button > Web Developer -> Web console

Another thing is to rule out a problem caused by add-ons, like the HTTPS Everywhere extension you have installed.
Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• On Windows you can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac you can open Firefox 4.0+ in Safe Mode by holding the option key while starting Firefox.
• On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
• Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select "'Start in Safe Mode"

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Yes, I already tried it in Safe Mode, but I still had the same problem.

Here's what I get on the Web Console:

[10:29:18.803] The X-Content-Security-Policy and X-Content-Security-Report-Only headers will be deprecated in the future. Please use the Content-Security-Policy and Content-Security-Report-Only headers with CSP spec compliant syntax instead. @ https://portal.adp.com/static/portlets/portal/theme/js/blank.html

[10:29:18.803] This site specified both an X-Content-Security-Policy/Report-Only header and a Content-Security-Policy/Report-Only header. The X-Content-Security-Policy/Report-Only header(s) will be ignored. @ https://portal.adp.com/static/portlets/portal/theme/js/blank.html

[10:29:22.393] GET https://portal.adp.com/wps/PA_CSSRemotePortApp/PortletAdapterTester?portletURL=http%3A%2F%2FWWVIP%3A9080%2Fmoney%2Ftheme%2Fadpportal1.css [HTTP/1.1 200 OK 411ms]

[10:29:22.501] Error in parsing value for 'white-space'. Declaration dropped. @ https://portal.adp.com/wps/myportal/sitemap/Employee/PayTax/PayStatements/!ut/p/c5/04_SB8K8xLLM9MSSzPy8xBz9CP0os3gfA1MzQyN_A3d3ZzdDA0d3N9eQAN8gI6Mgc6B8JE55A38jSnQbmFKk24CAbj-P_NxU_YLc0NCIckdFAJBaWnQ!/dl3/d3/L0lDU0lKSmdrS0NsRUpDZ3BSQ1NBL29Ob2dBRUlRaGpFS0lRQUJHY1p3aklDa3FTaFNOQkFOYUEhIS80QzFiOVdfTnIwZ0RFU1pJSlJERVNaTUpRaUlrZmchIS83X0wwNTYxMk8wR0dDRjEwQUdGRVRQTVIyMjc1L0tCWFlUMzU3NzAwMTIvaWJtLmludi8yNDYzNjc3Mzk4NTYvamF2YXguc2VydmxldC5pbmNsdWRlLnBhdGhfaW5mby8lMHBheXN0YXRlbWVudCUwbGlzdC5qc3A!/

[10:29:22.573] Content Security Policy: Directive default-src https://portal.adp.com:443 https://*.adp.com:443 https://*.google.com:443 violated by data:application/x-moz-playpreview-pdfjs;,

[10:29:22.761] Error in parsing value for 'cursor'. Declaration dropped. @ https://portal.adp.com/wps/PA_CSSRemotePortApp/PortletAdapterTester?portletURL=http%3A%2F%2FWWVIP%3A9080%2Fmoney%2Ftheme%2Fadpportal1.css:96

[10:29:22.761] Error in parsing value for 'white-space'. Declaration dropped. @ https://portal.adp.com/wps/PA_CSSRemotePortApp/PortletAdapterTester?portletURL=http%3A%2F%2FWWVIP%3A9080%2Fmoney%2Ftheme%2Fadpportal1.css:312

[10:29:22.762] Error in parsing value for 'cursor'. Declaration dropped. @ https://portal.adp.com/wps/PA_CSSRemotePortApp/PortletAdapterTester?portletURL=http%3A%2F%2FWWVIP%3A9080%2Fmoney%2Ftheme%2Fadpportal1.css:556

[10:29:22.762] Error in parsing value for 'cursor'. Declaration dropped. @ https://portal.adp.com/wps/PA_CSSRemotePortApp/PortletAdapterTester?portletURL=http%3A%2F%2FWWVIP%3A9080%2Fmoney%2Ftheme%2Fadpportal1.css:568

I am an IT tech and have had many users complain about this same issue, which started happening around the time of the Firefox v23 or later update. Users who are still on v22 do not have this issue.

To solve this, open Firefox and go to Options. Select the Applications section. There should be 3 or 4 options for "Adobe Acrobat xxxx" and another option for "Portable Document Format (pdf)". You will need to change the Action from "Use Adobe Acrobat in Firefox" to "Use Adobe Reader".

This will allow you to view the embedded pdf statements properly.

Hi Jellovator, thank you for that insight. The mixed content blocker went live in Firefox 23. It's odd that a site like ADP would have a mixed content problem with PDFs, but perhaps it is caused by some content pulled in by the PDF itself.

• For users who need a more step-by-step description of how to change your PDF viewer to an external viewer such as the Adobe Reader application, see this support article: View PDF files using Firefox’s built-in viewer. Unfortunately this is a global setting and can't be varied on a site-by-site basis.

• About the mixed content blocking feature: Mixed content blocking in Firefox

I had the same problem - started with Firefox 23. If I log in to adp portal at https://portal.adp.com/public/index.htm and try to click on a single pay stub, all pay stubs become highlighted and I get a blank page. However, if I log into directly to Ipay at https://ipay.adp.com/iPay/login.jsf (same login and password gets me in), I have no problem viewing my individual stubs. Company says it is a problem with Adobe 11 (which works fine with IE).

The selection of 'Use Adobe Acrobat (in Firefox) solved my problem with viewing ADP paystubs.