This can happen if the Firefox Password Manager isn't working properly.

Firefox stores the credentials for the Firefox Account as a hidden entry in the Password Manager and use these to login automatically (you may have to enter the master password or Windows PIN/Password).
Firefox will prompt you for the master password if you use this feature.
If you lose this entry in logins.json in the profile folder then you will have to authenticate each time you start Firefox and need to login.

Okay, and how do i exactly fix that?

Hello jesper,

You should also try this one to logged in everytime.

Firefox uses the Password Manager to store the credentials of the Firefox Sync account (chrome://FirefoxAccounts) to make it possible to connect to Sync each time you start Firefox without the need to enter email and password. If you use the master password then you need to enter the MP every time you start Firefox. If you are asked to login again to Sync then this means that the Sync credential data isn't stored properly in the Password Manager.

Do you see any entries in the Firefox Password Manager ?

Options/Preferences -> Privacy & Security: Logins and Passwords: "Saved Logins" -> "Show Passwords" You can check if you have a logins.json.corrupt file in the profile folder.

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

Help -> Troubleshooting Information -> Profile Directory: Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder https://support.mozilla.org/en-US/kb/Profiles

Thanks to ask the questions on this mozilla support.

I found the logins.json file, shall i remove it? Thanks!

Can you find a "Firefox Accounts credentials" entry in this logins.json file if you open the file in a Firefox tab ?

• "hostname": "chrome://FirefoxAccounts",
• "httpRealm": "Firefox Accounts credentials",

• https://developer.mozilla.org/en-US/Tools/JSON_viewer

Yes i can!

If you got your solution then please flag it's as a chosen solution for others let it know.

Sorry, my english isnt the best. I just found in the logins.json that it said "hostname": "chrome://FirefoxAccounts", "httpRealm": "Firefox Accounts credentials",

It doesnt work right now.

Is that file located in the current profile folder ?

If you have such a login item in logins.json then that would suggest that you have stored the credentials of the Firefox Account and you should be able to login without the need for further confirmation.

Yes it’s in the profile folder, but i still have to login everytime i open firefox with the code i get on my email which is annoying.