1391956 - tabs.onCreated event errors on Undo Closed Tab when all tabs have been closed

Status: RESOLVED INVALID

(Firefox :: Untriaged, defect)

Description

[michael_773]

Attachment: test.xpi

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0
Build ID: 20170814072924

Steps to reproduce:

Set browser.tabs.closeWindowWithLastTab set to false in about:config.
Install extension containing:

browser.tabs.onCreated.addListener( function() {
    // some code
} )

Close all tabs so that only the about:newtab that is created on the last tab close remains.




Actual results:

The onCreated event errors.
01:58:51.051 this.browser is null 1 ExtensionTabs.jsm:305
	get frameLoader resource://gre/modules/ExtensionTabs.jsm:305:5
	get frameLoader chrome://browser/content/ext-utils.js:496:5
	get width chrome://browser/content/ext-utils.js:549:5
	convert resource://gre/modules/ExtensionTabs.jsm:503:7
	convert resource://gre/modules/ExtensionTabs.jsm:1677:12
	listener chrome://browser/content/ext-tabs.js:121:24
	runSafeSyncWithoutClone resource://gre/modules/ExtensionUtils.jsm:61:14
	emit/promises< resource://gre/modules/ExtensionUtils.jsm:256:55
	from self-hosted:611:17
	emit resource://gre/modules/ExtensionUtils.jsm:255:20
	emitCreated chrome://browser/content/ext-utils.js:406:5
	handleEvent/< chrome://browser/content/ext-utils.js:256:13



Expected results:

The onCreated event should have fired.