While running Ubuntu I had Firefox running. During that time I was discovering the Panels options (those top and bottom panel bars). And I found the Add/Remove features of them. While trying to remove the 'space bracket' between the "show desktop" icon and Firefoxs' running application tab, I accidentally grabbed FFs' app tab and removed it. I've looked all over for it, yelled its name out loud a few times, but I dinna find it.
Now, it seems that whole feature is missing. No matter what app I open, its respective running app tab doesn't appear on the lower panel. Is there a way to return that feature to the lower panel (or any panel) that doen't involve uninstalling & reinstalling Ubuntu, or learning code? I haven't found a way so far.