The website did not load properly.

Load the web page. Then, to reload the page bypassing the cache and force a fresh retrieval; Ctrl+Shift+R (Mac=Command+Shift+R)

Try this several times.

It doesn't work. I would expect a reinstall to clear all data.

No, a reinstall only replaces the files in the Programs Folder. Useful in case something was corrupted.

Use these links to create a new profile. Use this new profile as is. Is the problem still there?

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Type about:profiles<enter> in the address bar.

What is the best way to completely remove all information regarding FF?

I installed 84 and apple forum works. This is a problem with 85.

https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer

Since 84 on a Mac OS allows the web site to work is support able to confirm this problem with 85?

This problem extends to FF android. Is this a know bug with 85 on the Mac OS?

This happens if you block CSS files.

You can check the Web Console (Tools -> Web Developer) for messages about blocked content and about the presence of mixed or unsafe content.

• https://developer.mozilla.org/en-US/docs/Tools/Web_Console

You can check the Network Monitor to see if content is blocked or otherwise fails to load.

• https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor

If necessary use "Ctrl+F5" or "Ctrl+Shift+R" (Mac: Command+Shift+R) to reload the page and bypass the cache to generate a fresh log.

I see the following on FF 85.

Loading failed for the <script> with source “https://communities.apple.com/en202012231040/public/compiled/pages/welcome.js”. welcome:1271:1 Loading failed for the <script> with source “https://communities.apple.com/en202012231040/public/scripts/dtml.js”. welcome:1529:1 Loading failed for the <script> with source “https://communities.apple.com/en202012231040/public/compiled/decorator.js”. welcome:1530:1 Loading failed for the <script> with source “https://communities.apple.com/ac20190730/globalnav/4/en_US/scripts/ac-globalnav.built.js”. welcome:1531:1

But I have 3 versions on the same workstation, another browser, FF 84 work but FF 85 doesn't.

Also upgrading to 85.01 doesn't correct the issue.

This problem maybe specific to Catalina version of Mac OS as I tried it on older Mac OS and it worked.

Version 86 does not correct the issue.

Although I performed the refresh FF action which did not correct the issue I uninstalled and reinstalled and the apple forum worked.

I think a uninstall app to remove FF completely should be included in FF. Also a method to completely save a profile to a single file for recovery.