| CARVIEW |
Select Language
HTTP/2 301
content-length: 162
content-type: text/html
date: Mon, 13 Oct 2025 00:56:42 GMT
location: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/theme
server: nginx
strict-transport-security: max-age=60; includeSubDomains
via: 1.1 google
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
HTTP/2 200
content-type: text/html
x-guploader-uploadid: AAwnv3Ks-HUOLm_y6cKKMvzZWJv_7g5qY5s7Cihrt4QxgIB-JtHYF5vCUMWFLi27EhJwzgEd
cache-control: public, max-age=3600
expires: Mon, 13 Oct 2025 01:56:43 GMT
last-modified: Fri, 10 Oct 2025 01:04:36 GMT
etag: W/"5a5e5a7d68a06c7a08ba0ad4803e639a"
x-goog-generation: 1760058276259848
x-goog-metageneration: 1
x-goog-stored-content-encoding: identity
x-goog-stored-content-length: 147620
x-goog-meta-goog-reserved-file-mtime: 1760056999
x-goog-hash: crc32c=tXsqwg==, md5=Wl5afWigbHoIugrUgD5jmg==
x-goog-storage-class: STANDARD
accept-ranges: none
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
alt-svc: clear
referrer-policy: strict-origin-when-cross-origin
x-content-type-options: nosniff
strict-transport-security: max-age=63072000
content-security-policy: default-src 'self'; script-src 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M=' 'sha256-YCNoU9DNiinACbd8n6UPyB/8vj0kXvhkOni9/06SuYw=' 'sha256-PZjP7OR6mBEtnvXIZfCZ5PuOlxoDF1LDZL8aj8c42rw='; script-src-elem 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M=' 'sha256-YCNoU9DNiinACbd8n6UPyB/8vj0kXvhkOni9/06SuYw=' 'sha256-PZjP7OR6mBEtnvXIZfCZ5PuOlxoDF1LDZL8aj8c42rw='; style-src 'report-sample' 'self' 'unsafe-inline'; object-src 'none'; base-uri 'self'; connect-src 'self' developer.allizom.org bcd.developer.allizom.org bcd.developer.mozilla.org updates.developer.allizom.org updates.developer.mozilla.org https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com https://incoming.telemetry.mozilla.org https://observatory-api.mdn.allizom.net https://observatory-api.mdn.mozilla.net https://api.github.com/search/issues stats.g.doubleclick.net https://api.stripe.com; font-src 'self'; frame-src 'self' interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net mdn.github.io live-samples.mdn.mozilla.net live-samples.mdn.allizom.net *.mdnplay.dev *.mdnyalp.dev *.play.test.mdn.allizom.net https://v2.scrimba.com https://scrimba.com jsfiddle.net www.youtube-nocookie.com codepen.io survey.alchemer.com https://js.stripe.com; img-src 'self' data: *.githubusercontent.com *.googleusercontent.com *.gravatar.com mozillausercontent.com firefoxusercontent.com profile.stage.mozaws.net profile.accounts.firefox.com developer.mozilla.org mdn.dev interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net wikipedia.org upload.wikimedia.org https://mdn.github.io/shared-assets/ https://mdn.dev/ https://*.google-analytics.com https://*.googletagmanager.com www.gstatic.com; manifest-src 'self'; media-src 'self' archive.org videos.cdn.mozilla.net https://mdn.github.io/shared-assets/; child-src 'self'; worker-src 'self';
x-frame-options: DENY
origin-trial: AxVILwizhbMjxFeHOn1P3R8niO1RJY/smaK4B4d1rLzc1gTaxtXMSaTi+FoigYgCw40uFRDwFcEAeqDR+vVLOW4AAABfeyJvcmlnaW4iOiJodHRwczovL2RldmVsb3Blci5tb3ppbGxhLm9yZyIsImZlYXR1cmUiOiJQcml2YXRlQXR0cmlidXRpb25WMiIsImV4cGlyeSI6MTc0MjA3OTYwMH0=
x-cloud-trace-context: 7862d9ccdf7bd28e5ae50db222a274fa
date: Mon, 13 Oct 2025 00:56:43 GMT
server: Google Frontend
via: 1.1 google
vary: Accept-Encoding
content-encoding: gzip
x-cache: miss
theme - Mozilla | MDN
Toggle sidebar
theme
Enables browser extensions to get details of the browser's theme and update the theme.
You can use this API to include a theme in your extension, which you define as a theme.Theme and apply using theme.update(). You cannot include a static theme in your extension, defined with the "theme" manifest key. The "theme" manifest key is used to define static themes only. See Themes on Extension Workshop for more information.
Types
theme.Theme-
Represents the content of a theme.
Functions
theme.getCurrent()-
Gets the current browser theme.
theme.update()-
Updates the browser's theme.
theme.reset()-
Removes any theme updates made in a call to
theme.update().
Events
theme.onUpdated-
Fired when the browser theme changes.
Example extensions
Browser compatibility
Loading…