Hi James

Did you install Firefox from the Windows app store?

Note that AppDate is a hidden folder.

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).

• Help -> More Troubleshooting Information -> Profile Folder/Directory:
  Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder
• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

Firefox MSIX from the MS Store has the profile in this location:

• C:\Users\xxx\AppData\Local\Packages\Mozilla.Firefox_xxxxxxxxxxxxx\LocalCache\Roaming\Mozilla\Firefox

Hi James Did you install Firefox from the Windows app store?

Long story short: Download Firefox from the website and NOT the Microsoft app store. The file path location from the app store is garbage, confusing and fraught with permission errors and hidden folder/files. In the end, I never could find it. I just uninstalled, deleted everything I could find with the words "Mozilla" and "Firefox" and then reinstalled from the website.

TL/DR: Do yourself a favor if you're reading this and download Firefox from the website like a normal human being, not from the app store like me. Thanks for pointing me in the right direction Paul.

- James

Why do you need to access the installation folder?

The Microsoft Store package (MSIX) is more restrictive but has better security.