I had this problem the first time after 1.2 update and restored backup so I did another fresh firmware update to bring back and see if it should work but same **** happens again. No I did not. Am I suppose to install it?
1) In the address bar of MicroB, type about:config
2) you'll be prompted a warning of warrant void something, do not proceed if you're afraid
3) in the filter, type user
4) you can find "general.useragent.vendor" at the bottom, select it and press enter