--- a/devtools/client/webconsole/net/main.js
+++ b/devtools/client/webconsole/net/main.js
@@ -33,17 +33,17 @@ var styleSheets = [
   "resource://devtools/client/webconsole/net/components/response-tab.css"
 ];
 
 // Load theme stylesheets into the Console frame. This should be
 // done automatically by UI Components as soon as we have consensus
 // on the right CSS strategy FIXME.
 // It would also be nice to include them using @import.
 styleSheets.forEach(url => {
-  loadSheet(this, url, "author");
+  loadSheet(window, url, "author");
 });
 
 // Localization API used by React components
 // accessing strings from *.properties file.
 // Example:
 //   let localizedString = Locale.$STR('string-key');
 //
 // Resources: