(firefox-trunk:2448): GLib-GObject-WARNING **: ../../../../gobject/gsignal.c:3492: signal name 'selection_changed' is invalid for instance '0x7f3a0edf5100' of type 'MaiAtkType139'
Extension error: TypeError: this.browser is null resource://gre/modules/ExtensionTabs.jsm 305
[[Exception stack
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
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
loadExtensionFile@moz-extension://2094ff6b-3225-4eab-a922-78546ce3ac60/background.js:12:3
@moz-extension://2094ff6b-3225-4eab-a922-78546ce3ac60/background.js:31:24
runSafeSyncWithoutClone@resource://gre/modules/ExtensionUtils.jsm:61:14
runSafeSync@resource://gre/modules/ExtensionUtils.jsm:94:37
runSafe@resource://gre/modules/ExtensionCommon.jsm:164:32
wrapPromise/<@resource://gre/modules/ExtensionCommon.jsm:353:13
promise callback*wrapPromise@resource://gre/modules/ExtensionCommon.jsm:342:7
callAsyncFunction@resource://gre/modules/ExtensionCommon.jsm:578:12
stub@resource://gre/modules/Schemas.jsm:2223:22
@moz-extension://2094ff6b-3225-4eab-a922-78546ce3ac60/background.js:29:1
Current stack
runSafeSyncWithoutClone@resource://gre/modules/ExtensionUtils.jsm:63:129
emit/promises<@resource://gre/modules/ExtensionUtils.jsm:256:55
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
loadExtensionFile@moz-extension://2094ff6b-3225-4eab-a922-78546ce3ac60/background.js:12:3
@moz-extension://2094ff6b-3225-4eab-a922-78546ce3ac60/background.js:31:24
runSafeSyncWithoutClone@resource://gre/modules/ExtensionUtils.jsm:61:14
runSafeSync@resource://gre/modules/ExtensionUtils.jsm:94:37
runSafe@resource://gre/modules/ExtensionCommon.jsm:164:32
wrapPromise/<@resource://gre/modules/ExtensionCommon.jsm:353:13
promise callback*wrapPromise@resource://gre/modules/ExtensionCommon.jsm:342:7
callAsyncFunction@resource://gre/modules/ExtensionCommon.jsm:578:12
stub@resource://gre/modules/Schemas.jsm:2223:22
@moz-extension://2094ff6b-3225-4eab-a922-78546ce3ac60/background.js:29:1
]]

###!!! [Parent][RunMessage] Error: Channel error: cannot send/recv