Hey there!

Please see the following link for the solution (to a similar case to yours):

https://support.mozilla.org/en-US/questions/1297207

Hope I helped!

Kind regards,

Bithiah

It does not help, there is no xulstore.json anywhere.

Hey there,

Please see the following:

https://support.mozilla.org/en-US/kb/changes-toolbars-and-window-sizes-are-not-saved https://support.mozilla.org/en-US/questions/1333884

Sorry about that!

Hope I helped!

Kind regards,

Bithiah

It does not help, there is no xulstore.json anywhere.

There should be such a file. It's possible you looked in the wrong folder.

C:\Users\<UserName>\AppData\Roaming\Mozilla\Firefox\Profiles not C:\Users\<UserName>\AppData\Local\Mozilla\Firefox\Profiles\

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.

• 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

There is no such file!

Can you attach a screenshot of the folder content that shows if you click Open Folder in List (detail) format ?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

Could it be the file is hidden or write-protected? DOS command: attrib -r -h *.* or Open your file explorer. Select that directory. At the top menu, select View. Turn on Hidden Items.

Hey there!

If your problem is solved, please mark a solution so that others can see this thread is solved. Thank you in advance!

Kind regards,

Bithiah