Firefox accounts always have a Primary email login and password there no way it doesn't have one to access the Firefox account. Only way to change password is that the Primary email is accessible to get the password reset links to change and verify the account. If neither of these are going to the Email login then there not much that users on here can do to help with lockout accounts.

You do not need a password to be able to launch Firefox and browse to websites and download files. Where did you download that version from in case you still remember ?

You can find the full installer of the current Firefox release (115.0.3) in all languages and all operating systems here:

• https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
• https://www.mozilla.org/en-US/firefox/115.0.3/releasenotes/