Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Persistent "Firefox profile cannot be loaded" error after update.

  • 3 replies
  • 104 have this problem
  • 13767 views
  • Last reply by FredMcD

more options

Hi!

After update to 56.0, I was getting multiple following messages when starting and/or using Firefox. Eventually, all my bookmarks loaded without problem, but the error windows appeared consistently:


"Your Firefox profile cannot be loaded. It may be missing or inaccessible."


Attempted solutions (with no success):

 - Delete %appdata%/Mozilla/Firefox/profiles.ini file
 - Delete the whole %appdata%/Mozilla/Firefox folder
 - Re-install firefox
 - Delete the %appdata%/Mozilla folder, delete C:\ProgramFiles\Mozilla Firefox folder and re-install
 - Remove old profile and add new one using "firefox.exe -P"
 - Repeat some of the above 5x

Working solution: Reboot

 - I noticed Kaspersky antivirus was demanding restart after its own update.
 - Firefox error said "inacsessible", and antivirus frequently locks out our files during development.
 - Kaspersky forces its plugins into browsers, so I gave restarting it a try.
 - The Firefox works after reboot with no errors even with the original (restored) contents of the %appdata%/Mozilla folder.

Suspected cause of the problem:

 - The Kaspersky automatically installs its extension into browsers (even after manually removing or disabling them). 
 - I suspect that the updates/installs somehow conflicted.

EDIT: Reformatting for better readability. Added missing info into "attempted" solutions.

Modified by akwky

Chosen solution

Hi, thanks, but this issue differs from all your linked ones in that it is *persistent* even after wiping all folders and reinstalling Firefox.

I have added more information into the original question. The working solution is also included:

Reboot the system.

Read this answer in context 👍 5

All Replies (3)

more options
more options

Chosen Solution

Hi, thanks, but this issue differs from all your linked ones in that it is *persistent* even after wiping all folders and reinstalling Firefox.

I have added more information into the original question. The working solution is also included:

Reboot the system.

Modified by akwky

more options

Have you contacted Kaspersky support? As a test, disable Kaspersky. Is the problem still there. Note: just start Firefox. Does it load properly?