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This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Returns a sidebar object, which contains several methods for registering add-ons with the browser.


The sidebar object returned has the following methods:

Method Description (SeaMonkey) Description (Firefox)
addPanel(title, contentURL, "") Adds a sidebar panel. Obsolete since Firefox 23 (only present in SeaMonkey).
End users can use the "load this bookmark in the sidebar" option instead. Also see Creating a Firefox sidebar.
addPersistentPanel(title, contentURL, "") Adds a sidebar panel, which is able to work in the background.
AddSearchProvider(descriptionURL) Installs a search provider (OpenSearch). Adding OpenSearch search engines contains more details. Added in Firefox 2.
addSearchEngine(engineURL, iconURL, suggestedTitle, suggestedCategory) Obsolete since Gecko 44 Installs a search engine (Sherlock). Adding Sherlock search engines contains more details.
IsSearchProviderInstalled(descriptionURL) Indicates if a specific search provider (OpenSearch) is installed.


Mozilla-specific. Not part of any standard.

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 Contributors to this page: IsaacSchemm
 Last updated by: IsaacSchemm,