window.sidebar.addSearchEngine() has been removed

Published: | Categories: DOM


The non-standard window.sidebar.addSearchEngine method and its alias window.external.addSearchEngine have been removed with Firefox 59. The ability to install legacy Sherlock search plug-ins had already been removed with Firefox 44, while OpenSearch plug-ins can still be installed using the window.external.AddSearchProvider method derived from Internet Explorer.

The window.sidebar object is no longer useful so it will also be removed in the future.