Why did my extension fail validation?

Why did my extension fail validation?

Can you provide more details about the issue?

This is no longer relevant. I had to remove the extension because when blocking the extension, mozilla does not provide information on why the publication was blocked.
It makes no sense to work with a company that is closed and treats its developers badly.
Now my extension is available for chrome users. And firefox users will be unable to use my extension.

What is your extension called?

Bookmarks Manager for New Tab | Speed Dial

When publishing to chrome webstore every time when my extension does not pass the test, I can get information why it is not published.
Mozilla does not consider it necessary to provide such information.
Mozilla simply states that the extension is not published.