Norton Toolbar 2015.5.4.10 on firefox/win10

Since I upgraded Win7 to Win10 my Norton toolbar on Firefox causes the browser to repeatedly go into 'not responding' and ultimately crash. When I try to restart Firefox it creates a firefox process but never appears on the desktop, I have to restart windows to get Firefox to restart. I verified that Norton Toolbar is causing the issue by putting Firefox into 'safe mode' and reenabling addons one at a time. When the toolbar is disabled I do not have the issues, when it is enabled the issues return. Symantec tells me I am at the latest version and Firefox gives a warning that Norton Toolbar is not verified to work with the version of Firefox I am using.

 

Anyone else having these types of issues?