Unable to login sync in to mozilla account (146.0)

[GIRATOR]

r3dfox-146.0.en-US.win64 on Win7 SP1 (not vm)
Unable to login sync in to mozilla account:
after entering email and pressing "sign up or sign in" button stays disabled, nothing happes, does not ask for password, no 2fa;
no errors in console, last request sent to "https://api.accounts.firefox.com/v1/account/status" (returns valid data);

• does not work on fresh profile or in troubleshoot mode;
• worked on r3dfox-142.0.1.en-US.win64
• works on firefox-146.0.1.en-US.win64 (Firefox-for-windows-7)

[the-r3dacted]

I suspect this comes from the Librewolf changes, but I'm not sure what specifically would do it.

Test this version and test 143, I suspect 143 will work and 144 will not.
https://github.com/Eclipse-Community/r3dfox/releases/tag/v144.0.1

[GIRATOR]

Tested, confirm that.
Now noticed that in 143 there is button on top of menu to manually trigger sign-in process, in 144 not present.

FYI: in 142, 143 and 144 hardaware key login (passkey/fido2) failing on key button press; Non-issue, as it works fine in 146.