It used to be that my add-ons were in the add-on bar at the bottom of Firefox. As of late, the same add-on in duplicated to the right of the navigation bar, east of the search box. How can I get rid of it there? I don't need it there; I have the add-on bar for that.
Can you attach a screenshot?
Use a compressed image type like PNG or JPG to save the screenshot.
Looks that they are added by an extension.
Do you get any tooltip if you hover those buttons?
Do you still see them in Safe mode?
You may see a toolbar button or sidebar from the Social features.
You can disable the Social features by setting the social.enabled pref to false on the about:config page.
I think what it is it's an add-in ("Stretch Clock") that installs itself in the address bar AND the add-in bar by design and there's nothing that can be done about it.