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.
Notes
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. | |
Specification
Mozilla-specific. Not part of any standard.
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                       Last updated by:
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