Hello,

Have you disabled Javascript on that site?

Is its CSS disabled?

Do you have a plug-in like No-Script which is prone to breaking sites?

If so, disable that and go back to your site. It should work!

Happy browsing!

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, DuckDuckGo PE, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content.

• make sure your extensions and filters are updated to the latest version
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content. You can click shield icon for more detail and possibly disable the protection. You can check the Web Console for relevant-looking messages about blocked content.

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

• Settings -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Settings -> Privacy & Security
  Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

As a side note:

Mozilla is gathering information on support issues caused by the Enhanced Tracking Protection (ETP) feature. If you can fix the page with the simple step of disabling ETP on the Chase login page, that would be helpful to know for optimizing this feature.

Here's where you would test that -- note that turning ETP on/off causes Firefox to reload the page to apply the changed rules:

More info: Enhanced Tracking Protection in Firefox for desktop

Hello, Have you disabled Javascript on that site? Is its CSS disabled? Do you have a plug-in like No-Script which is prone to breaking sites? If so, disable that and go back to your site. It should work! Happy browsing!

At this point, I have disabled all plug-ins and themes and have reset Firefox to its out of the box status, but the problem still persists.

As a side note: Mozilla is gathering information on support issues caused by the Enhanced Tracking Protection (ETP) feature. If you can fix the page with the simple step of disabling ETP on the Chase login page, that would be helpful to know for optimizing this feature. Here's where you would test that -- note that turning ETP on/off causes Firefox to reload the page to apply the changed rules: More info: Enhanced Tracking Protection in Firefox for desktop

Turning off ETP makes absolutely no difference, nor did clearing the cache and bookmarks, all plug ins and themes and resetting Firefox. Things do work in troubleshooting mode though.

As a side note: Mozilla is gathering information on support issues caused by the Enhanced Tracking Protection (ETP) feature. If you can fix the page with the simple step of disabling ETP on the Chase login page, that would be helpful to know for optimizing this feature. Here's where you would test that -- note that turning ETP on/off causes Firefox to reload the page to apply the changed rules: More info: Enhanced Tracking Protection in Firefox for desktop

It makes no difference whether ETF is on or off. I have removed cookies, cleared cache, disabled all plug ins and extensions and themes and reset to Firefox defaults with the same results. Things do work in troubleshooting mode though.

I found the problem and it was not Firefox, but the Trusteer Endpoint Protection program by IBM. After I uninstalled it, everything went back to normal.