Extension icon disappears

My extension was working for a day or so. When I opened FF this morning, it took awhile and was upgrading or compiling or something. Now when I open my browser I see cannot see Kee extension icon. I’ve removed extension and readded. Restarted FF. Still nothing.

Going to restart computer. About at my threshold for troubleshooting an extension.

*EDIT – Fixed. Restarted computer and whatever was the issue has disappeared.