I tried the update on Firefox from Ubuntu/Linux, it was a no go here as well.OOPS, sorry didn't realize you were running linuxcnc. The info I gave is for windows based machines. I don't have a linux based machine up and running right now so can't really dig into it.
If you can get to the internet, you should still be able to download a new installation. For the record, I am running V 37.0.2 on this machine.
Regards
mike sr