michael@0: function check_about_rights(tab) {
michael@0:   let doc = gBrowser.getBrowserForTab(tab).contentDocument;
michael@0:   ok(doc.getElementById("your-rights"), "about:rights content loaded");
michael@0:   gBrowser.removeTab(tab);
michael@0:   finish();
michael@0: }
michael@0: 
michael@0: function test() {
michael@0:   waitForExplicitFinish();
michael@0:   let tab = gBrowser.selectedTab = gBrowser.addTab("about:blank");
michael@0:   let browser = gBrowser.getBrowserForTab(tab);
michael@0:   browser.addEventListener("load", function() {
michael@0:       browser.removeEventListener("load", arguments.callee, true);
michael@0: 
michael@0:       ok(true, "about:rights loaded");
michael@0:       executeSoon(function() { check_about_rights(tab); });
michael@0:     }, true);
michael@0:   browser.loadURI("about:rights", null, null);
michael@0: }