 
This test checks that going back and forth across a slow-loading frame doesn't crash. If you got back here without crashing, you win.

If testing manually click here.

============== Back Forward List ==============
        http://127.0.0.1:8000/navigation/back-to-slow-frame.html  **nav target**
curr->  http://127.0.0.1:8000/navigation/resources/back-to-slow-frame-2.html  **nav target**
            http://127.0.0.1:8000/navigation/resources/slow-resource-1-sec.pl (in frame "<!--framePath //<!--frame0-->-->")
        http://127.0.0.1:8000/navigation/resources/back-to-slow-frame-3.html  **nav target**
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