After taking a snapshot, I can view the log using Chrome or IE, but in Firefox it hangs.
Specifically, what happens is that it starts to load the log, then displays the continue / stop script dialog. If you tell it to continue, it never completes and the browser is frozen. If you click "stop", you can then view the log and it is fully loaded.
I've tried this with a refreshed firefox with no plugins and it does the same thing. I even disabled the Firefox plugins, even though there's not a problem in IE or Chrome.
I note that in all browsers it takes a rather long time to load the log. Especially considering that all it's doing is loading a rather small text file.
I'm using Firefox 38.0.1 on a Windows 8.1 computer with the latest version of WordPress.