Also tried disabling uBlock.

Looks like CSP: https://i.imgur.com/vPtGmMr.png

This looks like a Firefox question, so I will move it from the Thunderbird to the Firefox list. Hopefully you will do better with helpful responses there.

Can you login to the Firefox account via this web page? In case of issues try to log in to the Firefox Account via this website.

• https://accounts.firefox.com/signin
• https://accounts.firefox.com/settings

cor-el said

Can you login to the Firefox account via this web page? In case of issues try to log in to the Firefox Account via this website.

• https://accounts.firefox.com/signin
• https://accounts.firefox.com/settings

I totally can. No dice with Monitor though.

Account is laurileet@gmail.com if that helps grep logs or smth.

Disabling CSP makes no difference.

Do you have the same problem with Firefox Send ?

• https://send.firefox.com

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

What do you see under Devices & Apps on the Firefox Account setting page?

• https://accounts.firefox.com/settings/clients

A bunch of stuff: https://i.imgur.com/p6Nqwhk.png

I'll try deleting them all and relogging. Thanks for the tip.

Deleted all the sessions, also noticed Firefox wants me to verify my primary email (noticed under 2FA setting), did that as well just in case.

Same error on Chrome, new and worse error with Firefox: https://i.imgur.com/Nvtl0LH.png

No problems with Firefox Send.

Hello MidnightRaver,

Earlier today another user reported the same problem :

https://support.mozilla.org/en-US/questions/1261230

If you want to, you could file a bug report (unless somebody comes up with a solution) :

https://bugzilla.mozilla.org/enter_bug.cgi

https://developer.mozilla.org/docs/Mozilla/QA/Bug_writing_guidelines

Changed Firefox password, no effect.

Do you see Firefox Send and Firefox Monitor listed on the Firefox Account settings page (Devices & Apps)?

cor-el said

Do you see Firefox Send and Firefox Monitor listed on the Firefox Account settings page (Devices & Apps)?

Yes.

I'm the other one who have the same problem. I also do see Firefox Monitor on Devices & Apps, I've closed several time the session opened, without any change. I do still have the same error message...

I have the same problem, and i'm also from France. So we are at least 3 with this issue on monitor.firefox.com It work with send.firefox.com It dosen't either with or without add-on on monitor.

The issue apear after changing password.

reported as bug here : https://bugzilla.mozilla.org/show_bug.cgi?id=1559718

1000i100 said

reported as bug here :
https://bugzilla.mozilla.org/show_bug.cgi?id=1559718

Thank you  !

Thank you very much for reported it !