background.js: "this" is null

[peter-lyons-kehl]

Hi team.

background.js logs "this is null", even on pages that don't have any RSS feed meta header:

tabUpdated moz-extension://7c99a36e-f1ee-424f-8bbd-de4c59657503/background.js:2
    apply self-hosted:2717
    applySafeWithoutClone resource://gre/modules/ExtensionCommon.jsm:616
    fire resource://gre/modules/ExtensionChild.jsm:806
    recvRunListener resource://gre/modules/ExtensionChild.jsm:810
    recvRunListener self-hosted:1176
    _recv resource://gre/modules/ConduitsChild.jsm:78
    receiveMessage resource://gre/modules/ConduitsChild.jsm:184
    (Async: JSActor query)
    _send resource://gre/modules/ConduitsChild.jsm:61
    _send resource://gre/modules/ConduitsParent.jsm:228
    _send self-hosted:1280
    listener resource://gre/modules/ExtensionParent.jsm:1001
    apply self-hosted:2717
    applySafeWithoutClone resource://gre/modules/ExtensionCommon.jsm:616
    applySafe resource://gre/modules/ExtensionParent.jsm:508
    async resource://gre/modules/ExtensionCommon.jsm:2415
    (Async: promise callback)
    async resource://gre/modules/ExtensionCommon.jsm:2413
    fireForTab chrome://browser/content/parent/ext-tabs.js:276
    (Async: promise callback)
    fireForTab chrome://browser/content/parent/ext-tabs.js:271
    statusListener chrome://browser/content/parent/ext-tabs.js:364
    onLocationChange chrome://extensions/content/parent/ext-tabs-base.js:1430
    callListeners chrome://browser/content/tabbrowser.js:826
    _callProgressListeners chrome://browser/content/tabbrowser.js:846
    _callProgressListeners chrome://browser/content/tabbrowser.js:5843
    onLocationChange chrome://browser/content/tabbrowser.js:6256