Im not quite sure when this happened as firefox isnt my primary browser, but as you can see from the pictures something is up with the title bar (I think its called this) 
I have tried fully uninstalling firefox, with appzapper, removing all related files, however this taint in the title bar persists.
I thank anyone who brings ideas to remedy this.
I have tried fully uninstalling firefox, with appzapper, removing all related files, however this taint in the title bar persists.
I thank anyone who brings ideas to remedy this.