--- a/toolkit/components/gfx/SanityTest.js
+++ b/toolkit/components/gfx/SanityTest.js
@@ -187,16 +187,17 @@ var listener = {
         this.runSanityTest();
         break;
     }
   },
 
   onWindowLoaded: function() {
     let browser = this.win.document.createElementNS(XUL_NS, "browser");
     browser.setAttribute("type", "content");
+    browser.setAttribute("disableglobalhistory", "true");
 
     let remoteBrowser = Services.appinfo.browserTabsRemoteAutostart;
     browser.setAttribute("remote", remoteBrowser);
 
     browser.style.width = PAGE_WIDTH + "px";
     browser.style.height = PAGE_HEIGHT + "px";
 
     this.win.document.documentElement.appendChild(browser);