Norton Toolbar disappeared from Firefox after Win10 Upgrade

Hi,

The toolbar was working fine in Firefox last night but this morning it is nowhere to be seen.  Looking in Extensions shows Norton Toolbar 2015.5.2.16 is enabled.

NTB Missing.PNGHow do I get it back, short of reinstalling NSwB?  Yes, I have run Live Update + Get Support.

Win10 x64

FF39

NSwB 22.5.2