After hours of troubleshooting the issue of: no green check marks with search results, I came into this Community and read that someone was able to get the green checks by going to "search.norton.com"
It worked for me as well. I apologize that I cannot give this person credit, but if by chance you read this post, thanks!!!
I also discovered that I could pin the tab for easy access by right-clicking on the search.norton.com TAB, which opens the menu to select Pin Tab. I closed and reopened my Firefox browser and the tab was still pinned to the farthest left side where tabs populate. I like this better than bookmarking, since I have so many bookmarks, and the tab stands out.
Until we get a bug fix from Norton, at least this temp-fix will give me some peace of mind searching the web. Hope this helps others.
[Norton 360 / can't ID version; Windows 10]