On your screenshot I see an option for "Don't ask for codes
again on this computer." The blurb below it indicates codes aren't
asked of "trusted computers," so that appears to be what it was
I gather you're not familiar with this process on google. I
believe the issue is due to the absence of a service on the
TenFourFox browser. The "Trust this computer" bit will appear over
the line you mentioned if the browser and MacOS are much newer.
For example, on Mountain Lion running the latest version of
The upshot is, the TenFourFox browser lacks something needed to
enable the "Trust this computer" option. Attached is a view of what
should be seen.
Yes, but speaking as the primary developer, I don't use this
service and I can't test it. If you need this fixed and you're
unable to propose a solution, it's very doubtful I will be able to
come up with one. We do have a 17.0.1 update coming out this
weekend which you could try, but I don't have any fixes I know of
in it specific to this.