Fires when the active tab in a window changes. Note that the tab's URL may not be set at the time this event fired, but you can listen to onUpdated events to be notified when a URL is set.
Syntax
browser.tabs.onActivated.addListener(function(
activeInfo // object
) {...})
browser.tabs.onActivated.removeListener(listener)
browser.tabs.onActivated.hasListener(listener)
Events have three functions:
addListener(callback)- Adds a listener to this event.
removeListener(listener)- Stop listening to this event. The
listenerargument is the listener to remove. hasListener(listener)- Check whether
listeneris registered for this event. Returnstrueif it is listening,falseotherwise.
addListener syntax
Parameters
callback-
Function that will be called when this event occurs. The function will be passed the following arguments:
activeInfoobject.
Additional objects
activeInfo
tabIdinteger. The ID of the tab that has become active.windowIdinteger. The ID of the tab's window.
Browser compatibility
Examples
Example add-ons
Acknowledgements
This API is based on Chromium's chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.
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