sessions.onChanged
Fired whenever the list of closed tabs or windows changes.
Syntax
js
browser.sessions.onChanged.addListener(listener)browser.sessions.onChanged.removeListener(listener)browser.sessions.onChanged.hasListener(listener)Events have three functions:
addListener(listener)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
listenerThe function called when this event occurs. It's passed no parameters.
Examples
This very annoying extension listens foronChanged, then immediately restores the most recently closed session, thus making it impossible to close windows or tabs:
js
function restoreSession(sessionInfos) { if (!sessionInfos.length) { console.log("No sessions found"); return; } let sessionInfo = sessionInfos[0]; if (sessionInfo.tab) { browser.sessions.restore(sessionInfo.tab.sessionId); } else { browser.sessions.restore(sessionInfo.window.sessionId); }}function onError(error) { console.log(error);}function restoreMostRecent() { let gettingSessions = browser.sessions.getRecentlyClosed({ maxResults: 1, }); gettingSessions.then(restoreSession, onError);}browser.sessions.onChanged.addListener(restoreMostRecent);Browser compatibility
Note:This API is based on Chromium'schrome.sessions API.