diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_scope.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_scope.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+function test() {
+  ok(!!gBrowser, "gBrowser exists");
+  is(gBrowser, getBrowser(), "both ways of getting tabbrowser work");
+}