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WebExtensions JavaScript APIs

JavaScript APIs for browser extensions supporting toolbars, bookmarks, cookies, downloads, and more.

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Field note

What it does

Cross-browser JavaScript APIs for WebExtensions used in background scripts, popups, sidebars, and content scripts. Supports browser namespace with Promises across Firefox, Chrome, and Safari.

Capabilities

Available capabilities

Browser ActionDeclarative network request handlingTab querying and managementBookmark managementDownload manager interactionCookie access and modification

Tags

Tags

Browser ExtensionJavaScriptCross-browser

Ways to use it

Ways to use it

sdk

javascript / webextension-polyfill

Product features

Product features

Browser namespace differences

Examples

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