browser.tabs.onMoved.addListener(listener)
browser.tabs.onMoved.removeListener(listener)
browser.tabs.onMoved.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 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:

tabId

integer. ID of the tab the user moved.

moveInfo

object. Information about the move. See the moveInfo section for more details.

windowId

integer. ID of this tab's window.

fromIndex

integer. Initial index of this tab in the window.

toIndex

integer. Final index of this tab in the window.

Listen for and log move events:

function handleMoved(tabId, moveInfo) {
  console.log(`Tab ${tabId} moved from ${moveInfo.fromIndex} to ${moveInfo.toIndex}`);
}

browser.tabs.onMoved.addListener(handleMoved);

• tabs-tabs-tabs