Browser toolbar
A browser toolbar is a toolbar that resides within a browser's window. All major web browsers provide support to browser toolbar development as a way to extend the browser's GUI and functionality. Browser toolbars are considered to be a particular kind of browser extension which presents a toolbar. Browser toolbars are specific to each browser, which means that a toolbar working on one browser will not work on another one. All browser toolbars must be installed in the corresponding browser before they can be used and require updates when new versions are released.
Many high-profile browser toolbars released over the years have been fraught with problems, either from intentional malware, from injected computer viruses or due to poor or conflicting programming when considering multiple toolbars being included on a single browser.