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.
Represents the content of a theme.
Fired when the browser theme changes.
BCD tables only load in the browser