In Firefox, you can right click on the toolbar area to get a menu that lets you select which toolbars show. You may be able to turn it off there.
Also check under tools / add ons and look for anything that doesn't seem to belong there. Items whose names smack of advertising or marketing are particularly suspect (i.e., "hotdealbar" or "savingssearch" or suchlike).
And, it goes without saying, don't accidentally click on popups in the future. %?)
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