Norton toolbar could not be verified for use in Firefox...

I seem to have received the patch announced today by Mohan_G:

https://community.norton.com/en/blogs/product-update-announcements/norton-2254-product-update-available-now

As it turns out, as soon as I ran LiveUpdate, the patch was installed and I now have version 22.5.4.24. For whatever reason, my Norton Toolbar 2015.5.4.10 FF add-on now shows the following note:

"Norton Toolbar could not be verified for use in Firefox. Proceed with caution.

How and why should I need to be cautious after having my Norton Product updated by Symantec?...

Please help.