Window.sidebar

Non-standard
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.

Methods

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) Dummy function; does nothing. See Autodiscovery of search plugins.
addSearchEngine(engineURL, iconURL, suggestedTitle, suggestedCategory) Obsolete since Gecko 44

Installs a search engine (Sherlock). Adding Sherlock search engines contains more details.

Note: This was made obsolete in Firefox 44, and has been removed completely in Firefox 59.

IsSearchProviderInstalled(descriptionURL) Indicates if a specific search provider (OpenSearch) is installed.

Specification

Mozilla-specific. Not part of any standard.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
sidebar
DeprecatedNon-standard
Chrome No support NoEdge No support NoFirefox Full support Yes
Notes
Full support Yes
Notes
Notes From Firefox 78 AddSearchProvider() does nothing, as the specification requires.
IE ? Opera ? Safari ? WebView Android No support NoChrome Android No support NoFirefox Android Full support YesOpera Android ? Safari iOS ? Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.
See implementation notes.
See implementation notes.