sidebarAction.setTitle()

Your extension should specify an title for the sidebar in the sidebar_action manifest key. This is called the "manifest title". If you don't specify the manifest title, it will default to the extension name.

If you set a new title using setTitle(), and include the tabId option, then the title is set only for the given tab. This title is called the "tab-specific title".

If you set a new title using setTitle(), and include the windowId option, then the title is set only for the given window. This title is called the "window-specific title", and will appear in all tabs of that window that do not have a tab-specific title set.

If you set a new title using setTitle(), and omit both the tabId and windowId options, then this sets the "global title". The global title will then appear in all tabs that do not have a tab-specific title set and whose window does not have a window-specific title.

details

object. An object with the following properties:

title

string or null. The sidebar's new title.

If title is an empty string, the used title will be the extension name, but sidebarAction.getTitle will still provide the empty string.

If title is null, then a previously set title will be removed, so that:

• If tabId is specified, and the tab has a tab-specific title set, then the tab will inherit the title from the window it belongs to.
• If windowId is specified, and the window has a window-specific title set, then the window will inherit the global title.
• Otherwise, the global title will be reset to the manifest title.

tabId Optional

integer. Sets the title only for the given tab.

windowId Optional

integer. Sets the title only for the given window.

• If windowId and tabId are both supplied, the function fails and the title is not set.
• If windowId and tabId are both omitted, the global title is set.

This code changes the title for the sidebar when the user clicks a browser action, but only for the current tab:

let title = "A different title";

function setTitleForTab(tab) {
  browser.sidebarAction.setTitle({title, tabId: tab.id});
}

browser.browserAction.onClicked.addListener(setTitleForTab);