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-rw-r--r--toolkit/content/widgets/browser.xml9
1 files changed, 5 insertions, 4 deletions
diff --git a/toolkit/content/widgets/browser.xml b/toolkit/content/widgets/browser.xml
index e595c847d..a30ff1c43 100644
--- a/toolkit/content/widgets/browser.xml
+++ b/toolkit/content/widgets/browser.xml
@@ -389,10 +389,11 @@
<method name="getTabBrowser">
<body>
<![CDATA[
- var tabBrowser = this.parentNode;
- while (tabBrowser && tabBrowser.localName != "tabbrowser")
- tabBrowser = tabBrowser.parentNode;
- return tabBrowser;
+ for (let node = this.parentNode; node instanceof Element; node = node.parentNode) {
+ if (node.localName == "tabbrowser")
+ return node;
+ }
+ return null;
]]>
</body>
</method>