You are on the editable version of MDN Web Docs

View as an MDN Web Docs user:

Type String
Mandatory Contingent: must be present if the _locales subdirectory is present, must be absent otherwise.
"default_locale": "en"

This key must be present if the extension contains the _locales directory, and must be absent otherwise. It identifies a subdirectory of _locales, and this subdirectory will be used to find the default strings for your extension.

See Internationalization.


"default_locale": "en"

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxOperaSafariFirefox for Android
default_localeChrome Full support YesEdge Full support 14Firefox Full support 48Opera Full support YesSafari Full support 14Firefox Android Full support 48


Full support  
Full support

Document Tags and Contributors

Contributors to this page: mdnwebdocs-bot, wbamberg, Makyen
Last updated by: mdnwebdocs-bot,