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web_extensions / latest / api / theme / update.html

theme.update()

Updates the browser theme according to the content of given Theme object.

Syntax

browser.theme.update(
  windowId,    // integer
  theme        // object
)

Parameters

windowId Optional

integer. The ID of a window. If this is provided, the theme is applied only to that window. If it is omitted the theme is applied to all windows.

theme

object. A Theme object specifying values for the UI elements you want to modify.

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
update No No 55 ? No No ? ? No ? No ?
windowId No No 57 ? No No ? ? No ? No ?

Examples

Sets the browser theme to use a sun graphic with complementary background color:

const suntheme = {
 images: {
   theme_frame: 'sun.jpg',
 },
 colors: {
   frame: '#CF723F',
   tab_background_text: '#111',
 }
};

browser.theme.update(suntheme);

Set the theme for just the currently focused window:

const day = {
    images: {
      theme_frame: 'sun.jpg',
    },
    colors: {
      frame: '#CF723F',
      tab_background_text: '#111',
    }
};

browser.menus.create({
  id: "set-theme",
  title: "set theme",
  contexts: ["all"]
});

async function updateThemeForCurrentWindow() {
  let currentWindow = await browser.windows.getLastFocused();
  browser.theme.update(currentWindow.id, day);
}

browser.menus.onClicked.addListener(updateThemeForCurrentWindow);

Example extensions

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https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/theme/update