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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	?	?	?
`windowId`	No	No	57	?	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