Fired when the currently focused window changes. Will be windows.WINDOW_ID_NONE if all browser windows have lost focus.
Note: In Windows and some Linux window managers, WINDOW_ID_NONE will always be sent immediately preceding a switch from one browser window to another.
browser.windows.onFocusChanged.addListener(listener)
browser.windows.onFocusChanged.removeListener(listener)
browser.windows.onFocusChanged.hasListener(listener)
Events have three functions:
addListener(callback)
Adds a listener to this event.
removeListener(listener)
Stop listening to this event. The listener argument is the listener to remove.
hasListener(listener)
Check whether a listener is registered for this event. Returns true if it is listening, false otherwise.
callback
Function that will be called when this event occurs. The function will be passed the following arguments:
windowId
integer. ID of the newly focused window.
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onFocusChanged |
Yes | 14 | 45 | ? | Yes | 14 | ? | ? | No | ? |
15Fires when toggling in or out of private browsing mode, leaving Safari to the home screen, and returning to Safari from the home screen. |
? |
Log focus changes:
browser.windows.onFocusChanged.addListener((windowId) => {
console.log(`Newly focused window: ${windowId}`);
});
Note: This API is based on Chromium's chrome.windows API. This documentation is derived from windows.json in the Chromium code.
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https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/windows/onFocusChanged